// ==UserScript==
// @name        知乎手机网页版改进
// @namespace   https://www.zhihu.com/
// @match       https://www.zhihu.com/
// @match       https://www.zhihu.com/?*
// @match       https://www.zhihu.com/question/*
// @match       https://www.zhihu.com/zvideo/*
// @match       https://zhuanlan.zhihu.com/p/*
// @grant       none
// @version     1.5.1
// @author      nameldk
// @description 使手机网页版可以加载更多答案
// @note        2023.05.02  v1.5.1 调整回复样式；自动隐藏回复收起按钮。
// @note        2023.05.01  v1.5.0 评论使用新接口；加载子回复。修复点击图片导致评论按钮消失的问题。
// @note        2023.04.30  v1.4.3 修复加载状态条不显示的问题。
// @note        2023.03.31  v1.4.2 修改展开、收起图标。隐藏专栏悬浮按钮。
// @note        2022.10.30  v1.4.1 避免页面切换时直接替换页面内容时绑定的事件消息，所以点击标题链接时重新加载页面(简单粗暴)。
// @note        2022.09.29  v1.4.0 获取回答使用新接口。
// @note        2022.09.20  v1.3.8 隐藏VIP推荐。
// @note        2022.08.05  v1.3.7 处理页面回答折叠未显示的问题。
// @note        2022.07.17  v1.3.6 处理LinkCard点击无效的问题。添加IP信息。显示评论表情。
// @note        2022.07.13  v1.3.5 处理部分答案重复显示的问题。
// @note        2022.06.26  v1.3.4 隐藏推荐；修复链接打开失败的问题。
// @note        2022.06.25  v1.3.3 隐藏底部按钮
// @note        2022.03.30  v1.3.2 添加评论数量
// @note        2022.03.19  v1.3.1 处理回答加载不出来的问题，处理查看所有回答点击错误
// @note        2022.01.29  v1.3.0 处理回答加载不出来的问题
// @note        2021.06.24  v1.2.9 处理评论样式
// @note        2021.06.10  v1.2.8 处理视频被误删除问题
// @note        2020.12.30  v1.2.7 处理首页和视频页面
// @note        2020.12.22  v1.2.6 修复链接无法打开的问题，外部链接直接打开
// @note        2020.10.13  v1.2.5 修复蒙层偶尔不消失的问题
// @note        2020.09.14  v1.2.4 修复评论超出的问题
// @note        2020.08.14  v1.2.3 适配新版页面
// @note        2020.08.13  v1.2.2 修复已加载完的评论切换排序不显示的问题
// @note        2020.08.03  v1.2.1 处理评论加载不完全,评论作者标识,收起按钮颜色区分,一些样式调整
// @note        2020.08.02  v1.2 处理gif,视频,收起后的定位,发布时间,页面被清空的问题
// @downloadURL none
// ==/UserScript==

const questionNumber = (location.href.match(/\/question\/(\d+)/)||[])[1];
const inDetailPage = location.href.match(/\/question\/\d+\/answer\/\d+/);
const inHomePage = location.pathname === '/';
const inZvideo = location.pathname.indexOf('/zvideo/') > -1;
const inZhuanlan = location.href.match(/zhuanlan\.zhihu\.com\/p\/\d+/)
const fromMobile = navigator.userAgent.match(/Android|iPhone|iPod|Opera Mini|IEMobile/i);

var is_end = 0;
var is_loading_answer = 0;
var is_loading_comment = 0;
var load_answer_id_map = {};
var EMOJI_URL_MAP = null;
var elList = null;
var elLoading = null;
var viewportElCheckList = [];
var debug = 0;
var init_done = 0;
var answer_next_url = null;
var _log_counter = 0;
var log = debug ? function () {
    return console.log.apply(console, ['mylog', ++_log_counter, new Date().toLocaleTimeString().substring(0,8)
    ].concat([].slice.call(arguments)));
} : function(){};


function forEachArray(arrayLike, cb) {
    if (arrayLike) {
        Array.prototype.forEach.call(arrayLike, el => cb(el));
    }
}

function forEachBySelector(s, cb) {
    Array.prototype.forEach.call(document.querySelectorAll(s), el => cb(el));
}

function removeBySelector(s) {
    forEachBySelector(s, ele => ele.remove());
}

function hideBySelector(s) {
    forEachBySelector(s, ele => ele.style.display = "none");
}

function hideByAddCss(s) {
    addStyle(`<style>${s}{display:none;}</style>`)
}

function getElementHeight(el) {
    if (el) {
        // el.offsetHeight
        return parseFloat(window.getComputedStyle(el, null).height.replace("px", ""));
    }
    return 0;
}

function isElementInViewport (el) {
    // https://stackoverflow.com/questions/123999/how-can-i-tell-if-a-dom-element-is-visible-in-the-current-viewport
    if (!el)
        return false;

    var rect = el.getBoundingClientRect();
    if (rect.top >= 0) { // ↓
        return rect.top < window.innerHeight;
    } else {
        return rect.top + rect.height > 0;
    }
}


function formatNumber(num) {
    if (num > 10000) {
        return (num / 10000).toFixed(2) + '万';
    } else {
        return num;
    }
}


function formatUrl(url, formatStr) {
    if (!formatStr)
        formatStr = 'xs';
    // s,xs,m, r
    return url.replace('{size}', formatStr);
}

function formatDate(e, t) {
    if(e.toString().length === 10) { // 秒
        e = e*1000;
    }
    e = new Date(e);
    // yyyy-MM-dd hh:mm:ss
    var n = {
        "M+": e.getMonth() + 1,
        "d+": e.getDate(),
        "h+": e.getHours(),
        "m+": e.getMinutes(),
        "s+": e.getSeconds(),
        "q+": Math.floor((e.getMonth() + 3) / 3),
        S: e.getMilliseconds()
    };
    /(y+)/.test(t) && (t = t.replace(RegExp.$1, (e.getFullYear() + "").substr(4 - RegExp.$1.length)));
    for (var r in n)
        new RegExp("(" + r + ")").test(t) && (t = t.replace(RegExp.$1, 1 === RegExp.$1.length ? n[r] : ("00" + n[r]).substr(("" + n[r]).length)));
    return t
}

function getDate(timestamp) {
    return formatDate(timestamp, 'yyyy-MM-dd');
}

function addStyle(styleStr) {
    if (styleStr) {
        document.body.insertAdjacentHTML('beforeend', styleStr);
    }
}

function stopPropagation(el) {
    if (el) {
        el.addEventListener('click', function (e) {
            e.stopPropagation();
        });
    }
}

function observerAddNodes(targetNode, cb) {
    if (!targetNode || !cb)
        return;
    const config = { childList:true, subtree: true };
    const callback = function(mutationsList) {
        for(const mutation of mutationsList) {
            if (mutation.addedNodes.length) {
                log('got_addNode', mutation.addedNodes.length, mutation.addedNodes);
                forEachArray(mutation.addedNodes, el => cb(el));
            }
        }
    };

    const observer = new MutationObserver(callback);
    observer.observe(targetNode, config);
}

function getEmojiImg(e) {
    if (!EMOJI_URL_MAP) {
        makeEmojiMap();
    }
    var t = EMOJI_URL_MAP[e];
    return t ? '<img data-zhihu-emoticon="'.concat(e, '" src="').concat(t, '" alt="').concat(e, '" />') : e;
}

function makeEmojiMap() {
    const EMOTICON_EMOJI = [{"static_image_url":"https://pic2.zhimg.com/v2-6fe2283baa639ae1d7c024487f1d68c7.png","title":"谢邀","placeholder":"[谢邀]"},{"static_image_url":"https://pic2.zhimg.com/v2-419a1a3ed02b7cfadc20af558aabc897.png","title":"赞同","placeholder":"[赞同]"},{"static_image_url":"https://pic4.zhimg.com/v2-66e5de3da039ac969d3b9d4dc5ef3536.png","title":"蹲","placeholder":"[蹲]"},{"static_image_url":"https://pic1.zhimg.com/v2-0942128ebfe78f000e84339fbb745611.png","title":"爱","placeholder":"[爱]"},{"static_image_url":"https://pic4.zhimg.com/v2-52f8c87376792e927b6cf0896b726f06.png","title":"害羞","placeholder":"[害羞]"},{"static_image_url":"https://pic2.zhimg.com/v2-72b9696632f66e05faaca12f1f1e614b.png","title":"好奇","placeholder":"[好奇]"},{"static_image_url":"https://pic4.zhimg.com/v2-bffb2bf11422c5ef7d8949788114c2ab.png","title":"思考","placeholder":"[思考]"},{"static_image_url":"https://pic4.zhimg.com/v2-c96dd18b15beb196b2daba95d26d9b1c.png","title":"酷","placeholder":"[酷]"},{"static_image_url":"https://pic1.zhimg.com/v2-3ac403672728e5e91f5b2d3c095e415a.png","title":"大笑","placeholder":"[大笑]"},{"static_image_url":"https://pic1.zhimg.com/v2-3700cc07f14a49c6db94a82e989d4548.png","title":"微笑","placeholder":"[微笑]"},{"static_image_url":"https://pic1.zhimg.com/v2-b62e608e405aeb33cd52830218f561ea.png","title":"捂脸","placeholder":"[捂脸]"},{"static_image_url":"https://pic4.zhimg.com/v2-0e26b4bbbd86a0b74543d7898fab9f6a.png","title":"捂嘴","placeholder":"[捂嘴]"},{"static_image_url":"https://pic4.zhimg.com/v2-3bb879be3497db9051c1953cdf98def6.png","title":"飙泪笑","placeholder":"[飙泪笑]"},{"static_image_url":"https://pic2.zhimg.com/v2-f3b3b8756af8b42bd3cb534cbfdbe741.png","title":"耶","placeholder":"[耶]"},{"static_image_url":"https://pic1.zhimg.com/v2-aa15ce4a2bfe1ca54c8bb6cc3ea6627b.png","title":"可怜","placeholder":"[可怜]"},{"static_image_url":"https://pic2.zhimg.com/v2-3846906ea3ded1fabbf1a98c891527fb.png","title":"惊喜","placeholder":"[惊喜]"},{"static_image_url":"https://pic4.zhimg.com/v2-dd613c7c81599bcc3085fc855c752950.png","title":"流泪","placeholder":"[流泪]"},{"static_image_url":"https://pic1.zhimg.com/v2-41f74f3795489083630fa29fde6c1c4d.png","title":"大哭","placeholder":"[大哭]"},{"static_image_url":"https://pic4.zhimg.com/v2-6a976b21fd50b9535ab3e5b17c17adc7.png","title":"生气","placeholder":"[生气]"},{"static_image_url":"https://pic4.zhimg.com/v2-0d9811a7961c96d84ee6946692a37469.png","title":"惊讶","placeholder":"[惊讶]"},{"static_image_url":"https://pic1.zhimg.com/v2-76c864a7fd5ddc110965657078812811.png","title":"调皮","placeholder":"[调皮]"},{"static_image_url":"https://pic1.zhimg.com/v2-d6d4d1689c2ce59e710aa40ab81c8f10.png","title":"衰","placeholder":"[衰]"},{"static_image_url":"https://pic2.zhimg.com/v2-7f09d05d34f03eab99e820014c393070.png","title":"发呆","placeholder":"[发呆]"},{"static_image_url":"https://pic1.zhimg.com/v2-4e025a75f219cf79f6d1fda7726e297f.png","title":"机智","placeholder":"[机智]"},{"static_image_url":"https://pic4.zhimg.com/v2-f80e1dc872d68d4f0b9ac76e8525d402.png","title":"嘘","placeholder":"[嘘]"},{"static_image_url":"https://pic3.zhimg.com/v2-b779f7eb3eac05cce39cc33e12774890.png","title":"尴尬","placeholder":"[尴尬]"},{"static_image_url":"https://pic1.zhimg.com/v2-c65aaaa25730c59f5097aca04e606d88.png","title":"小情绪","placeholder":"[小情绪]"},{"static_image_url":"https://pic1.zhimg.com/v2-132ab52908934f6c3cd9166e51b99f47.png","title":"为难","placeholder":"[为难]"},{"static_image_url":"https://pic4.zhimg.com/v2-74ecc4b114fce67b6b42b7f602c3b1d6.png","title":"吃瓜","placeholder":"[吃瓜]"},{"static_image_url":"https://pic2.zhimg.com/v2-58e3ec448b58054fde642914ebb850f9.png","title":"语塞","placeholder":"[语塞]"},{"static_image_url":"https://pic3.zhimg.com/v2-4e4870fc6e57bb76e7e5924375cb20b6.png","title":"看看你","placeholder":"[看看你]"},{"static_image_url":"https://pic2.zhimg.com/v2-1043b00a7b5776e2e6e1b0af2ab7445d.png","title":"撇嘴","placeholder":"[撇嘴]"},{"static_image_url":"https://pic2.zhimg.com/v2-e6270881e74c90fc01994e8cd072bd3a.png","title":"魔性笑","placeholder":"[魔性笑]"},{"static_image_url":"https://pic1.zhimg.com/v2-99bb6a605b136b95e442f5b69efa2ccc.png","title":"潜水","placeholder":"[潜水]"},{"static_image_url":"https://pic4.zhimg.com/v2-6551348276afd1eaf836551b93a94636.png","title":"口罩","placeholder":"[口罩]"},{"static_image_url":"https://pic2.zhimg.com/v2-c99cdc3629ff004f83ff44a952e5b716.png","title":"开心","placeholder":"[开心]"},{"static_image_url":"https://pic4.zhimg.com/v2-8a8f1403a93ddd0a458bed730bebe19b.png","title":"滑稽","placeholder":"[滑稽]","id":"1114211774655778817"},{"static_image_url":"https://pic4.zhimg.com/v2-ca0015e8ed8462cfce839fba518df585.png","title":"笑哭","placeholder":"[笑哭]"},{"static_image_url":"https://pic2.zhimg.com/v2-d4f78d92922632516769d3f2ce055324.png","title":"白眼","placeholder":"[白眼]"},{"static_image_url":"https://pic2.zhimg.com/v2-9ab384e3947547851cb45765e6fc1ea8.png","title":"红心","placeholder":"[红心]"},{"static_image_url":"https://pic4.zhimg.com/v2-a8f46a21217d58d2b4cdabc4568fde15.png","title":"柠檬","placeholder":"[柠檬]"},{"static_image_url":"https://pic2.zhimg.com/v2-3e36d546a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    EMOJI_URL_MAP = {};
    EMOTICON_EMOJI.forEach(e => {
        EMOJI_URL_MAP[e.placeholder] = e.static_image_url;
    });
}

function debounce(fn, delay) {
    let timer
    return function () {
        const context = this;
        const args = arguments;
        if (timer) {
            clearTimeout(timer)
        }
        timer = setTimeout(function () {
            fn.apply(context, args)
        }, delay);
    };
}

// ---biz---


// --- common biz ---

function processContinue() {
    document.body.classList.remove('ModalWrap-body');
    document.body.style.overflow = "auto";
    // question
    removeBySelector('div.Card.AnswersNavWrapper div.ModalWrap');
    // zvideo
    removeBySelector('#root > div > main > article > div.ModalWrap');
}

function addCommonStyle() {
    let style = `<style>
.CommentsForOia, #div-gpt-ad-bannerAd,div.Card.AnswersNavWrapper div.ModalWrap, .MobileModal-backdrop,
        .MobileModal--plain.ConfirmModal,.AdBelowMoreAnswers,div.Card.HotQuestions, button.OpenInAppButton.OpenInApp,
        .DownloadGuide-inner, .DownloadGuide, div.OpenInAppButton, div.Card.RelatedReadings {
        display: none;
    }
.CommentItemV2 {
    position: relative;
    -ms-flex-negative: 0;
    flex-shrink: 0;
    padding: 10px 5px;
    font-size: 15px
}
.CommentItemV2-footer {
    box-sizing: border-box;
    display: flex;
}
.CommentItemV2-time {
    font-size: 13px;
    color: #8590a6;
    flex: 1 1 auto;
}
.CommentItemV2-content {
    margin-bottom: 6px;
    line-height: 25px;
}
.CommentItemV2-reply, .CommentItemV2-roleInfo, html[data-theme=dark] .CommentItemV2-reply, html[data-theme=dark] .CommentItemV2-roleInfo {
    color: #8590a6;
}
.NestComment .NestComment--child {
    position: relative;
    padding-left: 33px;
}
.CommentRichText img[data-zhihu-emoticon] {
    height: 1.4em;
    width: 1.4em;
    vertical-align: bottom;
}
</style>`;
    addStyle(style);
}

function removeCommonBlock() {
    removeBySelector('button.OpenInAppButton');
    removeBySelector('.CommentsForOia');
}

function skipOpenApp() {
    log('run:skipOpenApp');
    // .ContentItem.AnswerItem
    // .RichContent.is-collapsed.RichContent--unescapable
    Array.prototype.forEach.call(document.querySelectorAll('.ContentItem.AnswerItem'), function (ele) {
        let elRichContentInner = ele.querySelector('.RichContent-inner');
        let elRichContent = ele.querySelector('.RichContent');
        let button = ele.querySelector('button');

        if (button) {
            button.style.display = 'none';
        }
        if (elRichContentInner && elRichContent) {
            let elMTimeMeta = ele.querySelector('meta[itemprop="dateModified"]');
            let elCTimeMeta = ele.querySelector('meta[itemprop="dateCreated"]');

            if (elMTimeMeta && elCTimeMeta) {
                let mTime = elMTimeMeta.getAttribute('content').toString().split('T')[0];
                let cTime = elCTimeMeta.getAttribute('content').toString().split('T')[0];
                let elATime = ele.querySelector('.ContentItem-time');
                let url = elCTimeMeta.previousElementSibling.getAttribute('content');
                let mHtml = '';

                if (mTime !== cTime) {
                    mHtml = `<span class="my-updated-time">编辑于 ${mTime}</span>`;
                }
                let tmpHtml = `<div>
            <div class="ContentItem-time">
                <a target="_blank" href="${url}">
                    <span>发布于 ${cTime}</span>${mHtml}
                </a>
            </div>
            </div>`;
                if (elATime) {
                    elATime.remove();
                }
                elRichContentInner.insertAdjacentHTML('afterend', tmpHtml);
            }

            setTimeout(function () {
                if (!elRichContent.classList.contains('is-collapsed')) {
                    return;
                }
                log('process:is-collapsed');
                ele.classList.add('my-fold');
                elRichContentInner.insertAdjacentHTML('afterend', `<span class="my-more-btn down-img"></span><span class="my-less-btn up-img"></span>`);
                elRichContent.classList.remove('is-collapsed');
                elRichContentInner.setAttribute("style", "");
                processFold(elRichContent);
            }, 1000);

            forEachArray(elRichContentInner.querySelectorAll('.GifPlayer'), el => {
                el.addEventListener('click', () => {
                    let elImg = el.querySelector('img'),
                        elIcon = el.querySelector('svg'),
                        url = elImg.getAttribute('src').toString().replace('.jpg', '.webp');
                    if (elIcon) {
                        elImg.setAttribute('src', url);
                        elIcon.remove();
                    }
                });
            });

            let eleVoteButton = ele.querySelector('.VoteButton--up');
            if (eleVoteButton) {
                eleVoteButton.style = null;
            }

        } else {
            log('RichContent not found')
        }


        ele.addEventListener("click", function (event) {
            event.preventDefault();
            event.stopPropagation();
            if (elRichContentInner) {
                elRichContentInner.setAttribute("style", "");
            }
        });

        bindClickComment(ele.parentElement);
    });


}

function removeAds() {
    log('run:removeAds');
    Array.prototype.forEach.call(document.querySelectorAll('.MBannerAd'), function (ele) {
        ele.parentNode.removeChild(ele)
    });
}

function removeBlock() {
    log('run:removeBlock');
    removeBySelector('.MobileModal-backdrop');
    removeBySelector('.MobileModal--plain.ConfirmModal');
    removeBySelector('.AdBelowMoreAnswers');
    removeBySelector('div.Card.HotQuestions');
    removeBySelector('div.KfeCollection-VipRecommendCard');
    hideBySelector('div.ModalWrap');

    let counter = 3;
    let interval = null;
    interval = setInterval(function () {
        forEachBySelector('iframe', ele => {
            if (!ele.getAttribute('src').toString().match(/^https?:\/\/[a-zA-Z0-9]+?\.?zhihu.com\//)) {
                ele.remove();
            }
        });
        counter--;
        if (counter < 0) {
            clearInterval(interval);
        }
    }, 1000);
}


function processContent(content) {
    if (!content)
        return '';
    var r = /<img src="data:image.+?"(.+?)data-actualsrc="(.+?)"\/>/g;
    return content.replace(r, '<img src="$2"$1/>');
}

function loadContent(url) {
    let myHeaders = new Headers();
    const myInit = {
        method: 'GET',
        headers: myHeaders,
    };

    return fetch(url, myInit).then(response => response.json());
}

function genAnswerItemHtml(data) {
    var content = processContent(data.content);
    let upTimeHtml = '';
    if (getDate(data.created_time) !== getDate(data.updated_time)) {
        upTimeHtml = `<span class="my-updated-time">编辑于 ${formatDate(data.updated_time, 'yyyy-MM-dd')}</span>`;
    }
    let headline = data.author.headline ||
        data.author.badge_v2 && data.author.badge_v2.detail_badges[0] && data.author.badge_v2.detail_badges[0].description ||
        data.author.badge && data.author.badge[0] && data.author.badge[0].description || '';

    var html = `<div class="List-item" tabindex="0" id="answer-${data.id}">
    <div class="ContentItem AnswerItem my-fold" data-za-index="0">
        <div class="ContentItem-meta">
            <div class="AuthorInfo AnswerItem-authorInfo AnswerItem-authorInfo--related" itemprop="author" itemscope=""
                 itemtype="http://schema.org/Person">
                <span class="UserLink AuthorInfo-avatarWrapper">
                    <a class="UserLink-link"
                       target="_blank"
                       href="//www.zhihu.com/people/${data.author.url_token}">
                        <img class="Avatar AuthorInfo-avatar" width="38" height="38"
                             src="${data.author.avatar_url_template}"
                             alt="">
                    </a>
                </span>
                <div class="AuthorInfo-content">
                    <div class="AuthorInfo-head">
                        <span class="UserLink AuthorInfo-name">
                        <a class="UserLink-link"
                           target="_blank"
                           href="//www.zhihu.com/people/${data.author.url_token}">${data.author.name}</a>
                        </span>
                    </div>
                    <div class="AuthorInfo-detail">
                        <div class="AuthorInfo-badge">
                            <div class="ztext AuthorInfo-badgeText">${headline}</div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <meta itemprop="image">
        <meta itemprop="upvoteCount" content="${data.voteup_count}">
        <meta itemprop="url" content="https://www.zhihu.com/question/${questionNumber}/answer/${data.id}">
        <meta itemprop="dateCreated" content="${formatDate(data.created_time, 'yyyy-MM-ddThh:mm:ss')}.000Z">
        <meta itemprop="dateModified" content="${formatDate(data.updated_time, 'yyyy-MM-ddThh:mm:ss')}.000Z">
        <meta itemprop="commentCount" content="${data.comment_count}">
        <div class="RichContent RichContent--unescapable">
            <div class="RichContent-inner RichContent-inner--collapsed">
                <span class="RichText ztext CopyrightRichText-richText" itemprop="text">
                ${content}
                </span>
            </div>
            <div>
            <div class="ContentItem-time">
                <a target="_blank" href="//www.zhihu.com/question/${questionNumber}/answer/${data.id}">
                    <span>发布于 ${formatDate(data.created_time, 'yyyy-MM-dd')}</span>${upTimeHtml}
                </a>
            </div>
            </div>

            <span class="my-more-btn down-img"></span>
            <span class="my-less-btn up-img"></span>

            <div class="ContentItem-actions">
                <span>
                    <button aria-label="赞同 ${formatNumber(data.voteup_count)}" type="button" class="Button VoteButton VoteButton--up">
                        <span style="display: inline-flex; align-items: center;">&#8203;
                            <svg class="Zi Zi--TriangleUp VoteButton-TriangleUp" fill="currentColor" viewBox="0 0 24 24"
                                 width="10" height="10">
                            <path d="M2 18.242c0-.326.088-.532.237-.896l7.98-13.203C10.572 3.57 11.086 3 12 3c.915 0 1.429.571 1.784 1.143l7.98 13.203c.15.364.236.57.236.896 0 1.386-.875 1.9-1.955 1.9H3.955c-1.08 0-1.955-.517-1.955-1.9z"
                                  fill-rule="evenodd"></path></svg>
                        </span>赞同 ${formatNumber(data.voteup_count)}
                    </button>
                    <button aria-label="反对" type="button"
                            class="Button VoteButton VoteButton--down VoteButton--mobileDown">
                        <span style="display: inline-flex; align-items: center;">&#8203;
                        <svg class="Zi Zi--TriangleDown" fill="currentColor" viewBox="0 0 24 24" width="10" height="10"><path
                                d="M20.044 3H3.956C2.876 3 2 3.517 2 4.9c0 .326.087.533.236.896L10.216 19c.355.571.87 1.143 1.784 1.143s1.429-.572 1.784-1.143l7.98-13.204c.149-.363.236-.57.236-.896 0-1.386-.876-1.9-1.956-1.9z"
                                fill-rule="evenodd"></path></svg>
                    </span>
                    </button>
                </span>
                <button type="button"
                        class="Button ContentItem-action Button--plain Button--withIcon Button--withLabel"><span
                        style="display: inline-flex; align-items: center;">&#8203;<svg class="Zi Zi--Comment Button-zi"
                                                                                       fill="currentColor"
                                                                                       viewBox="0 0 24 24" width="1.2em"
                                                                                       height="1.2em"><path
                        d="M10.241 19.313a.97.97 0 0 0-.77.2 7.908 7.908 0 0 1-3.772 1.482.409.409 0 0 1-.38-.637 5.825 5.825 0 0 0 1.11-2.237.605.605 0 0 0-.227-.59A7.935 7.935 0 0 1 3 11.25C3 6.7 7.03 3 12 3s9 3.7 9 8.25-4.373 9.108-10.759 8.063z"
                        fill-rule="evenodd"></path></svg></span>评论 ${formatNumber(data.comment_count)}
                </button>
                <button type="button" class="Button ContentItem-action Button--plain Button--withIcon Button--iconOnly">
                    <span style="display: inline-flex; align-items: center;">&#8203;<svg class="Zi Zi--Star Button-zi"
                                                                                         fill="currentColor"
                                                                                         viewBox="0 0 24 24"
                                                                                         width="1.2em" height="1.2em"><path
                            d="M5.515 19.64l.918-5.355-3.89-3.792c-.926-.902-.639-1.784.64-1.97L8.56 7.74l2.404-4.871c.572-1.16 1.5-1.16 2.072 0L15.44 7.74l5.377.782c1.28.186 1.566 1.068.64 1.97l-3.89 3.793.918 5.354c.219 1.274-.532 1.82-1.676 1.218L12 18.33l-4.808 2.528c-1.145.602-1.896.056-1.677-1.218z"
                            fill-rule="evenodd"></path></svg></span></button>
            </div>
        </div>
    </div>
</div>`;
    return html;
}


function genVideoHtml(videoId) {
    if (!videoId)
        return '';

    var html = `<div class="RichText-video" data-za-detail-view-path-module="VideoItem" data-za-extra-module="{&quot;card&quot;:{&quot;content&quot;:{&quot;type&quot;:&quot;Video&quot;,&quot;sub_type&quot;:&quot;SelfHosted&quot;,&quot;video_id&quot;:&quot;${videoId}&quot;,&quot;is_playable&quot;:true}}}">
    <div class="VideoCard VideoCard--interactive VideoCard--mobile">
        <div class="VideoCard-layout">
            <div class="VideoCard-video">
                <div class="VideoCard-video-content">
                    <div class="VideoCard-player"><iframe frameborder="0" allowfullscreen="" src="https://www.zhihu.com/video/${videoId}?autoplay=false&amp;useMSE="></iframe></div>
                </div>
            </div>
        </div>
        <div class="VideoCard-mask"></div>
    </div>
</div>
`;
    return html;
}

function processVideo(elAncestor) {
    if (elAncestor && elAncestor.querySelectorAll) {
        forEachArray(elAncestor.querySelectorAll('a.video-box'), el => {
            let videoId = el.dataset.lensId;
            if (videoId) {
                let html = genVideoHtml(videoId);
                let div = document.createElement('div');
                div.innerHTML = html;
                el.insertAdjacentElement('afterend', div);
                el.parentElement.removeChild(el);
            }
        });
    }
}

function getListWrap() {
    if (!elList) {
        elList = document.querySelectorAll('.Question-main .List');
        if (elList)
            elList = elList[elList.length - 1];
    }
    return elList;
}

function loadAnswer() {
    if (is_end || is_loading_answer) {
        return;
    }
    if (elLoading) {
        elLoading.classList.remove('hide');
    }
    is_loading_answer = 1;

    if (answer_next_url === null) {
        let elInit = document.querySelector('#js-initialData');
        if (!elInit) {
            return console.error('js-initialData not found.')
        }

        try {
            let jsonInit = JSON.parse(elInit.innerText);
            let answer = jsonInit.initialState.question.answers[questionNumber];
            answer_next_url = answer['next'];
        } catch (e) {
            return console.error(e);
        }
    }

    loadContent(answer_next_url).then(function (data) {
        if (!answer_next_url) {
            console.error('next_url empty');
            return
        }
        if (elLoading) {
            elLoading.classList.add('hide');
        }
        log('get data:', answer_next_url);
        if (data.paging.is_end) {
            is_end = 1;
        }
        answer_next_url = data.paging.next;
        let elListWrap = getListWrap();
        if (elListWrap) {
            processLinkCard(elListWrap);
            data.data.forEach(function (item) {
                if (item.target_type !== 'answer') {
                    return log('not_answer:', item);
                }

                if (!load_answer_id_map[item.target.id]) {
                    load_answer_id_map[item.target.id] = 1;
                    let elListItemWrap = document.createElement('div');
                    elListItemWrap.innerHTML = genAnswerItemHtml(item.target);
                    elListWrap.insertAdjacentElement("beforeend", elListItemWrap);
                    processFold(elListItemWrap.querySelector('.RichContent'));
                    bindClickComment(elListItemWrap);
                    processAHref(elListItemWrap);
                    processVideo(elListItemWrap);
                } else {
                    log('duplicate answer', item.target.id)
                }
            });
            if (is_end) {
                let html = '<div style="text-align: center; padding: 10px;">全部回答已加载完成...</div>'
                elListWrap.insertAdjacentHTML("beforeend", html);
            }
        } else {
            console.warn('elListWrap empty');
        }
    }).catch(function (err) {
        console.error('load failed', err)
    }).then(function () {
        is_loading_answer = 0;
        log('loading finish')
    })
}


function addViewportCheckList(elListItem) {
    if (elListItem) {
        viewportElCheckList.push(elListItem);
    }
}

function removeViewportCheckList(elListItem) {
    viewportElCheckList.forEach(function (v, i) {
        if (v === elListItem) {
            viewportElCheckList.splice(i, 1);
        }
    })
}

function processFold(elRichContent) {
    var elMoreBtn = elRichContent.querySelector('.my-more-btn');
    var elLessBtn = elRichContent.querySelector('.my-less-btn');
    var elContentItem = elLessBtn.closest('.ContentItem');
    if (elMoreBtn && elLessBtn && elContentItem) {
        let height = getElementHeight(elRichContent);
        if (height > 0 && height < 400 && elRichContent.querySelectorAll('img').length < 2) {
            elContentItem.classList.remove('my-fold');
            elMoreBtn.remove();
            elLessBtn.remove();
        } else {
            elMoreBtn.addEventListener('click', function (e) {
                elContentItem.classList.add('my-unfold');
                elContentItem.classList.remove('my-fold');
                addViewportCheckList(elContentItem);
            });
            elLessBtn.addEventListener('click', function (e) {
                elContentItem.classList.add('my-fold');
                elContentItem.classList.remove('my-unfold');

                removeViewportCheckList(elContentItem);
                window.scrollTo(0, elContentItem.closest('.List-item').offsetTop);
            });
        }
    }
}

function bindLoadData() {
    log('run:bindLoadData');
    var el;
    if (inDetailPage) {
        el = document.querySelector('.Card.ViewAll');
        if (!el) {
            console.warn('bindLoadData failed');
            return;
        }
        el.style.textAlign = "center";
        el.innerHTML = '<a class="QuestionMainAction ViewAll-QuestionMainAction" href="'+location.href.replace(/\/answer.+/,'')+'">查看所有回答<a>';
        return;
    }
    document.querySelectorAll('.Question-main .Card').forEach(function (elCard) {
        if (!el && elCard.classList && elCard.classList.length === 1) {
            el = elCard;
        }
    });
    if (!el) {
        console.warn('bindLoadData failed');
        return;
    }
    el.insertAdjacentHTML('afterend', `<div id="my-loading" class="hide"><div class="loadingio-spinner-dual-ring-41hxycfuw5t"><div class="ldio-4crll70kj">
<div></div><div><div></div></div>
</div></div></div>`);

    elLoading = document.getElementById('my-loading');
    window.onscroll = function() {
        if (is_end) {
            return;
        }
        if ((window.innerHeight + window.scrollY + 100) >= document.body.offsetHeight) {
            log('reach bottom');
            loadAnswer();
        }
    };
}

function bindProcessViewport() {
    log('run:bindProcessViewport');
    var interval;
    document.addEventListener('scroll', function () {
        if (interval) {
            clearTimeout(interval);
        }
        interval = setTimeout(function () {
            // log('scroll-view:', viewportElCheckList.length);
            if (viewportElCheckList.length) {
                viewportElCheckList.forEach(function (elListItem) {
                    var elLessBtn = elListItem.querySelector('.my-less-btn');
                    if (isElementInViewport(elListItem)) {
                        elLessBtn.classList.remove('hide');
                    } else {
                        elLessBtn.classList.add('hide');
                    }
                });
            }
        }, 100);
    }, false);
}

function loadCommentData(answerId, offset, isReverse) {
    if (!answerId) {
        return;
    }
    let url = `https://www.zhihu.com/api/v4/comment_v5/answers/${answerId}/root_comment?order_by=score&limit=20&offset=${offset}`;
    if (isReverse)
        url = `https://www.zhihu.com/api/v4/comment_v5/answers/${answerId}/root_comment?order_by=ts&limit=20&offset=${offset}`;
    return fetch(url).then(response => response.json());
}

function loadChildCommentData(rootCommentId, offset) {
    let url = `https://www.zhihu.com/api/v4/comment_v5/comment/${rootCommentId}/child_comment?order_by=ts&limit=20&offset=${offset}`
    return fetch(url).then(response => response.json());
}

function getOffsetFromUrl(url) {
    let m = url.toString().match(/offset=(\w+)&?/);
    return m ? m[1] : '';
}

function processChildComment(elButton) {
    if (!elButton) {
        return;
    }
    let elWrap = elButton.parentElement.previousElementSibling,
        elLoading = elButton.previousElementSibling,
        rootId = elButton.dataset.rootId,
        skipIds = elButton.dataset.skipIds.toString().split(','),
        offset = elButton.dataset.offset || '',
        loading = elButton.dataset.loading || '',
        end = 0,
        loadingTimer;

    if (elButton.classList.contains('hide')) {
        return;
    }
    elButton.classList.add('hide');
    loadingTimer = setTimeout(() => elLoading.classList.remove('hide'), 500);
    loadChildCommentData(rootId, offset).then(function (json) {
        let html = '';
        json.data.forEach(function (v) {
            if (skipIds.indexOf(v.id) === -1) {
                html += genCommentItemHtml(v, 'child');
            }
        });

        if (json.paging.is_end) {
            // html += '<div class="my-center">子回复已全部加载完成...</div>'
            end = 1;
        } else {
            elButton.dataset.offset = getOffsetFromUrl(json.paging.next);
        }

        elWrap.insertAdjacentHTML('beforeend', html)
    }).finally(function () {
        loadingTimer && clearTimeout(loadingTimer);
        elLoading.classList.add('hide');
        if (!end) {
            elButton.classList.remove('hide');
        }
    })
}

function bindClickComment(elListItem) {
    if (!elListItem)
        return;
    let elButton = elListItem.querySelector('button.ContentItem-action.Button--withLabel');
    let elComment = elListItem.querySelector('.Comments-container');

    if (!elButton) {
        let elContentItemActions = elListItem.querySelector('.ContentItem-actions');
        if (!elContentItemActions) {
            console.warn('bindClickComment failed');
            return;
        }
        let metaComment = elContentItemActions.parentElement.previousElementSibling.parentElement.querySelector('meta[itemprop="commentCount"]');
        let commentCount = metaComment && metaComment.getAttribute('content') || '';
        elButton = document.createElement('span');
        elButton.innerHTML = `<button type="button" class="Button ContentItem-action Button--plain Button--withIcon Button--withLabel"><span style="display: inline-flex; align-items: center;">&ZeroWidthSpace;<svg class="Zi Zi--Comment Button-zi" fill="currentColor" viewBox="0 0 24 24" width="1.2em" height="1.2em"><path d="M10.241 19.313a.97.97 0 0 0-.77.2 7.908 7.908 0 0 1-3.772 1.482.409.409 0 0 1-.38-.637 5.825 5.825 0 0 0 1.11-2.237.605.605 0 0 0-.227-.59A7.935 7.935 0 0 1 3 11.25C3 6.7 7.03 3 12 3s9 3.7 9 8.25-4.373 9.108-10.759 8.063z" fill-rule="evenodd"></path></svg></span> 评论 ${commentCount}</button>`;
        elContentItemActions.appendChild(elButton);
    }

    let fnFoldToggle = debounce(function () {
        let elCommentWrap = elButton.elCommentWrap,
            elCommentFold = elButton.elCommentFold;
        if (!elCommentWrap || !elCommentFold) {
            return
        }
        let rect = elCommentWrap.getBoundingClientRect()
        if (rect.top > -200 && rect.top < 600) {
            elCommentFold.classList.remove('hide')
        } else {
            elCommentFold.classList.add('hide')
        }
    }, 100);

    elButton.addEventListener('click', function () {
        let bindFold = () => document.addEventListener('scroll', fnFoldToggle, false);
        let unbindFold = () => document.removeEventListener('scroll', fnFoldToggle, false);

        if (elComment) {
            elComment.classList.toggle('hide');
            if (elComment.classList.contains('hide')) {
                unbindFold();
            } else {
                bindFold();
            }
        } else {
            let answerId = (elListItem.querySelector('.ContentItem-meta ~ meta[itemprop="url"]').getAttribute('content').match(/\/answer\/(\d+)/) || [])[1];
            elComment = addCommentWrap(elListItem, answerId);

            let elCommentWrap = elComment.querySelector('.CommentListV2');
            let elSwitchBtn = elComment.querySelector('div.Topbar-options > button');
            let elCommentFold = elComment.querySelector('a.comment-fold');

            elComment.dataset.answerId = answerId;
            elComment.dataset.offset = "";

            elButton.elCommentWrap = elCommentWrap; // bind data
            elButton.elCommentFold = elCommentFold;

            processComment(elComment, elCommentWrap);

            elCommentWrap.addEventListener('scroll', function(){
                if (elCommentWrap.scrollTop + elCommentWrap.offsetHeight + 100 > elCommentWrap.scrollHeight) {
                    processComment(elComment, elCommentWrap);
                }
            }, false);

            elCommentWrap.addEventListener('click', function(event){
                if (event.target.closest('button.btn-child-comment')) {
                    processChildComment(event.target)
                }
            }, false);


            elSwitchBtn.addEventListener('click', function(){
                if (elSwitchBtn.innerText.replace(/[\s​]+/, '') === '切换为时间排序') {
                    elSwitchBtn.innerText = '切换为默认排序';
                    elComment.dataset.isReverse = "1";
                } else {
                    elSwitchBtn.innerText = '切换为时间排序';
                    elComment.dataset.isReverse = "0";
                }
                elComment.dataset.offset = "";
                elComment.dataset.isEnd = "0";
                elCommentWrap.innerHTML = '';
                processComment(elComment, elCommentWrap);
            });

            elCommentFold.addEventListener('click', function(){
                elComment.classList.add('hide');
                unbindFold();
            });

            bindFold();
        }
    });
}

function addCommentWrap(elListItem, answerId) {
    if (!elListItem)
        return;
    var commentCount = elListItem.querySelector('meta[itemprop="commentCount"]').getAttribute('content');
    let html = `<div class="Comments-container" id="comment-block-${answerId}">
    <div class="CommentsV2 CommentsV2--withEditor">
        <div class="Topbar CommentTopbar">
            <div class="Topbar-title"><h2 class="CommentTopbar-title">${commentCount} 条评论</h2></div>
            <div class="Topbar-options">
                <button type="button" class="Button Button--plain Button--withIcon Button--withLabel">
                    <span style="display: inline-flex; align-items: center;">&#8203;
                        <svg class="Zi Zi--Switch Button-zi" fill="currentColor" viewBox="0 0 24 24" width="1.2em" height="1.2em">
                            <path d="M13.004 7V4.232c0-.405.35-.733.781-.733.183 0 .36.06.501.17l6.437 5.033c.331.26.376.722.1 1.033a.803.803 0 0 1-.601.264H2.75a.75.75 0 0 1-.75-.75V7.75A.75.75 0 0 1 2.75 7h10.254zm-1.997 9.999v2.768c0 .405-.35.733-.782.733a.814.814 0 0 1-.5-.17l-6.437-5.034a.702.702 0 0 1-.1-1.032.803.803 0 0 1 .6-.264H21.25a.75.75 0 0 1 .75.75v1.499a.75.75 0 0 1-.75.75H11.007z" fill-rule="evenodd"></path></svg>
                    </span>切换为时间排序
                </button>
            </div>
        </div>
        <a class="comment-fold up-img"></a>
        <div class="CommentListV2">
        </div>
    </div>
</div>`;
    elListItem.insertAdjacentHTML("beforeend", html);
    return elListItem.querySelector('.Comments-container');
}

function genCommentHtml(dataList) {
    if (!dataList || !dataList.length)
        return '';
    let html = '';
    dataList.forEach(function(data) {
        let liClass = data.child_comment_count ? 'rootComment' : 'rootCommentNoChild';
        let tmp = genCommentItemHtml(data, liClass);
        if (data.child_comment_count) {
            let skipIds = [];
            data.child_comments.forEach(function (v) {
                skipIds.push(v.id)
                tmp += genCommentItemHtml(v, 'child');
            });
            if (data.child_comment_count > data.child_comments.length) {
                tmp += '<div class="child-comment-wrap"></div><div class="my-center"><span class="hide">加载中...</span>'
                tmp += `<button data-root-id="${data.id}" data-skip-ids="${skipIds.join(',')}" type="button" class="btn-child-comment Button Button--secondary Button--grey css-1p04wnp">查看全部 ${data.child_comment_count} 条回复<span style="display: inline-flex; align-items: center;">&ZeroWidthSpace;<svg width="24" height="24" viewBox="0 0 24 24" class="ZDI ZDI--ArrowRightSmall24" fill="currentColor"><path fill-rule="evenodd" d="m13.248 12-4.025 3.78a.684.684 0 0 0 0 1.01.796.796 0 0 0 1.075 0l4.42-4.15a.867.867 0 0 0 0-1.28l-4.42-4.15a.796.796 0 0 0-1.075 0 .684.684 0 0 0 0 1.01L13.248 12Z" clip-rule="evenodd"></path></svg></span></button>`
                tmp += '</div>'
            }
        }
        html += `<ul class="NestComment">${tmp}</ul>`;
    });
    return html;
}


function genCommentItemHtml(item, liClass) {
    var replyHtml = '';
    let authorTagHtml = '';
    if (item.author_tag && item.author_tag.length) {
        if (item.author_tag.filter(v => v.type === 'content_author')[0]) {
            authorTagHtml = '<span class="author-tag">作者</span>'
        }
    }
    if (item.reply_to_author) {
        let tagHtml = ''
        if (item.reply_author_tag && item.reply_author_tag.length) {
            if (item.reply_author_tag.filter(v => v.type === 'content_author')[0]) {
                tagHtml = `<span class="CommentItemV2-roleInfo author-tag">作者</span>`;
            }
        }
        replyHtml += `
<svg width="12" height="12" viewBox="0 0 16 16" class="ZDI ZDI--ArrowRightAlt16 css-gx7lzm" fill="currentColor"><path d="M10.727 7.48a.63.63 0 0 1 0 1.039l-4.299 2.88c-.399.268-.926-.028-.926-.519V5.12c0-.491.527-.787.926-.52l4.299 2.881Z"></path></svg>
<span class="UserLink">
    <a class="UserLink-link" data-za-detail-view-element_name="User" target="_blank"
    href="//www.zhihu.com/people/${item.reply_to_author.url_token}">${item.reply_to_author.name}</a>${tagHtml}
</span>`;
    }
    let ip_info = item.comment_tag.filter(v => v.type === 'ip_info')[0];
    let author_top = item.comment_tag.filter(v => v.type === 'author_top')[0];
    let dot = ' · ';
    let address_text = ip_info && ip_info['text'] ? ip_info['text']
        .replace('IP 属地', '').replace('未知', '') + dot : '';
    let hot = item.hot ? `<span>${dot}热评</span>` : '';
    let pin = author_top ? `<span>${dot}置顶</span>` : '';
    let content = item.content.replace(/\[.{1,8}?\]/g, getEmojiImg)
        .replace(/<a([^<>]+?>)/g, function (match, p1) {
            if (match.indexOf('href') > -1) { // open in new tab
                if (p1.indexOf('target=') === -1) {
                    return '<a target="_blank" '+ p1;
                } else {
                    return match.replace(/target=['"][^'"]*['"]/, 'target="_blank"');
                }
            } else {
                return match;
            }
        });
    var html = `<li class="NestComment--${liClass}">
        <div class="CommentItemV2">
            <div class="comment-item-wrap">
                <div class="CommentItemV2-meta">
                    <span class="UserLink CommentItemV2-avatar">
                        <a class="UserLink-link" data-za-detail-view-element_name="User" target="_blank"
                           href="//www.zhihu.com/people/${item.author.url_token}">
                            <img class="Avatar UserLink-avatar"
                                 width="30" height="30"
                                 src="${formatUrl(item.author.avatar_url_template, 's')}"
                                 srcset="${formatUrl(item.author.avatar_url_template, 'xs')} 2x"
                                 alt="${item.author.name}">
                        </a>
                    </span>
                </div>
                <div class="CommentItemV2-metaSibling">
                    <span class="UserLink">
                        <a class="UserLink-link" data-za-detail-view-element_name="User"
                           target="_blank" href="//www.zhihu.com/people/${item.author.url_token}">${item.author.name}
                        </a>
                        ${authorTagHtml}
                    </span>${replyHtml}
                    <div class="CommentRichText CommentItemV2-content">
                        <div class="RichText ztext">${content}</div>
                    </div>
                    <div class="CommentItemV2-footer">
                        <span class="CommentItemV2-time">${address_text}${getDate(item.created_time)}${hot}${pin}</span>
                        <button type="button" class="Button CommentItemV2-likeBtn Button--plain"><span
                                style="display: inline-flex; align-items: center;">&#8203;<svg
                                class="Zi Zi--Like" fill="currentColor" viewBox="0 0 24 24" width="16"
                                height="16" style="margin-right: 5px;"><path
                                d="M14.445 9h5.387s2.997.154 1.95 3.669c-.168.51-2.346 6.911-2.346 6.911s-.763 1.416-2.86 1.416H8.989c-1.498 0-2.005-.896-1.989-2v-7.998c0-.987.336-2.032 1.114-2.639 4.45-3.773 3.436-4.597 4.45-5.83.985-1.13 3.2-.5 3.037 2.362C15.201 7.397 14.445 9 14.445 9zM3 9h2a1 1 0 0 1 1 1v10a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V10a1 1 0 0 1 1-1z"
                                fill-rule="evenodd"></path></svg></span>${item.like_count}
                        </button>
                    </div>
                </div>
            </div>
        </div>
    </li>`;
    return html;
}

function genCommentLoding() {
    var html = `<div>
    <div class="PlaceHolder CommentItemV2">
        <div class="PlaceHolder-inner">
            <div class="PlaceHolder-bg"></div>
            <svg width="656" height="44" viewBox="0 0 656 44" class="PlaceHolder-mask">
                <path d="M0 0h656v44H0V0zm0 0h480v12H0V0zm0 32h238v12H0V32z" fill="currentColor"
                      fill-rule="evenodd"></path>
            </svg>
        </div>
    </div>
</div>`;
    var el = document.createElement('div');
    el.innerHTML = html;
    return el;
}

function processComment(elComment, elCommentWrap) {
    if (!elComment || !elCommentWrap || is_loading_comment) {
        return;
    }
    let offset = elComment.dataset.offset,
        answerId = elComment.dataset.answerId,
        isReverse = +elComment.dataset.isReverse,
        isEnd = +elComment.dataset.isEnd
    ;
    if (!answerId || isEnd) {
        return;
    }

    log('beginLoadComment', offset);
    is_loading_comment = 1;
    let elLoading = genCommentLoding();
    elCommentWrap.appendChild(elLoading);
    loadCommentData(answerId, offset, isReverse).then(function (json) {
        log('getCommentData', offset);
        elComment.dataset.offset = getOffsetFromUrl(json.paging.next);
        elCommentWrap.removeChild(elLoading);
        elLoading = null;
        let html = genCommentHtml(json.data);
        if (json.paging.is_end) {
            elComment.dataset.isEnd = "1";
            html += '<div style="text-align: center; padding: 10px;">全部评论已加载完成...</div>'
        }
        elCommentWrap.insertAdjacentHTML('beforeend', html);
        processAHref(elCommentWrap);
    }).catch(function (err) {
        console.warn('load comment failed', err);
    }).then(function () {
        is_loading_comment = 0;
        elLoading = null;
    });
}

function processAHref(elAncestor) {
    log('run:processAHref');
    if (elAncestor && elAncestor.querySelectorAll) {
        forEachArray(
            elAncestor.querySelectorAll('a[href^="https://link.zhihu.com/"]'),
            ele => {
                log('a_href', ele.getAttribute('href'));
                ele.setAttribute('href', decodeURIComponent(ele.getAttribute('href').replace('https://link.zhihu.com/?target=', '')));
                ele.setAttribute('target', '_blank');
                stopPropagation(ele);
            }
        );
        forEachArray(
            elAncestor.querySelectorAll('a[href^="https://"],a[href^="http://"]'),
            ele => stopPropagation(ele)
        )
    }
}

function processLinkCard(elRichContent) {
    // .RichContent-inner will be replaced, .RichContent will keep.
    observerAddNodes(elRichContent, el => {
        log(el);
        if (el.tagName === 'A' && el.href && el.href.indexOf('http') === 0) {
            processAHref(el.parentElement)
        }
    });
}

function processAllLink() {
    // https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver
    processAHref(document);
    observerAddNodes(document, el => {
        if (el.tagName === 'A' && el.href && el.href.indexOf('http') === 0) {
            processAHref(el.parentElement)
        }
    });
}

function addCss() {
    log('run:addCss');
    var style = `
<style type="text/css">
    .my-fold .RichContent-inner {
        max-height: 400px;
    }
    .my-fold .my-more-btn {
        display: block;
    }
    .my-fold .my-less-btn {
        display:none;
    }
    .my-unfold .RichContent-inner {
        max-height: none;
    }
    .my-unfold .my-more-btn {
        display: none;
    }
    .my-unfold .my-less-btn {
        display: block;
    }
    
    .up-img {
        background: url(data:image/png;base64,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);
        background-repeat: no-repeat;
        background-size: 20px 20px;
        width: 20px;
        height: 20px;
        display: inline-block;
    }
    .down-img {
        background: url(data:image/png;base64,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);
        background-repeat: no-repeat;
        background-size: 20px 20px;
        width: 20px;
        height: 20px;
        display: inline-block;
    }
    .my-more-btn {
        float: right;
        padding: 0 10px 10px 10px;
    }
    .my-less-btn {
        position: fixed;
        top: 10%;
        right: 10px;
        padding: 0 10px 10px 10px;
        z-index: 2;
    }
    #my-loading {
        text-align: center;
        padding-bottom: 10px;
    }
    .hide, .my-less-btn.hide {
        display: none;
    }
    .CommentListV2 {
        max-height: 500px;
        overflow-y: scroll;
    }
    a.comment-fold {
        position: fixed;
        right: 10px;
        bottom: 30%;
        padding: 10px;
        z-index: 2;
    }
    .my-updated-time {
        margin-left: 10px;
    }
    .my-center {
        margin: 0 auto;
        text-align: center;
    }
    .author-tag {
        position: relative;
        padding: 0px 4px;
        height: 16px;
        line-height: 16px;
        box-sizing: border-box;
        font-size: 10px;
        color: rgb(153, 153, 153);
    }
    .author-tag::before {
        display: block;
        content: " ";
        position: absolute;
        inset: -50%;
        pointer-events: none;
        transform: scale(0.5, 0.5);
        border: 1px solid rgb(211, 211, 211);
        border-radius: 4px;
    }
    .comment-item-wrap {
        box-sizing: border-box;
        margin: 0px;
        min-width: 0px;
        display: flex;
        padding: 10px 0px 6px;
    }
    .CommentItemV2-meta {
        box-sizing: border-box;
        margin: 0px;
        min-width: 0px;
        flex: 0 0 auto;
    }
    .CommentItemV2-metaSibling {
        box-sizing: border-box;
        margin: 0px 0px 0px 10px;
        min-width: 0px;
        flex: 1 1 auto;    
    }
    img.UserLink-avatar {
        box-sizing: border-box;
        margin: 0px;
        min-width: 0px;
        max-width: 100%;
        width: 30px;
        height: 30px;
        border-radius: 50%;
        filter: brightness(0.95);
        display: block;
        position: relative;
        background-color: rgb(246, 246, 246);
        flex: 0 0 auto;
        text-indent: -9999px;
        overflow: hidden;
    }
</style>
<style type="text/css">
@keyframes ldio-4crll70kj {
  0% { transform: rotate(0) }
  100% { transform: rotate(360deg) }
}
.ldio-4crll70kj div { box-sizing: border-box!important }
.ldio-4crll70kj > div {
  position: absolute;
  width: 76px;
  height: 76px;
  top: 12px;
  left: 12px;
  border-radius: 50%;
  border: 8px solid #000;
  border-color: #fe718d transparent #fe718d transparent;
  animation: ldio-4crll70kj 1.4925373134328357s linear infinite;
}
.ldio-4crll70kj > div:nth-child(2) { border-color: transparent }
.ldio-4crll70kj > div:nth-child(2) div {
  position: absolute;
  width: 100%;
  height: 100%;
  transform: rotate(45deg);
}
.ldio-4crll70kj > div:nth-child(2) div:before, .ldio-4crll70kj > div:nth-child(2) div:after {
  content: "";
  display: block;
  position: absolute;
  width: 8px;
  height: 8px;
  top: -8px;
  left: 26px;
  background: #fe718d;
  border-radius: 50%;
  box-shadow: 0 68px 0 0 #fe718d;
}
.ldio-4crll70kj > div:nth-child(2) div:after {
  left: -8px;
  top: 26px;
  box-shadow: 68px 0 0 0 #fe718d;
}
.loadingio-spinner-dual-ring-41hxycfuw5t {
  width: 54px;
  height: 54px;
  display: inline-block;
  overflow: hidden;
  background: none;
}
.ldio-4crll70kj {
  width: 100%;
  height: 100%;
  position: relative;
  transform: translateZ(0) scale(0.54);
  backface-visibility: hidden;
  transform-origin: 0 0; /* see note above */
}
.ldio-4crll70kj div { box-sizing: content-box; }
/* generated by https://loading.io/ */
</style>
    `;
    addStyle(style);
}

function processHomePage() {
    function processBtn(objBtn) {
        if (!objBtn || objBtn.innerText.indexOf('内查看') === -1)
            return;
        let elParent = objBtn.parentNode;

        let elContentItem = objBtn.closest('.ContentItem');
        let elUrl = elContentItem && elContentItem.querySelector('meta[itemprop="url"]');
        let url = '';
        if (elUrl && elUrl.getAttribute("content")) {
            url = elUrl.getAttribute("content");
            let elNew = document.createElement('a');
            elNew.className = "Button ContentItem-more Button--plain";
            elNew.href = url;
            elNew.target="_blank";
            elNew.innerText = "打开详情";
            elParent.replaceChild(elNew, objBtn);
            stopPropagation(elNew);
        }
    }

    function processBtnAll(targetNode) {
        if (targetNode && targetNode.querySelectorAll) {
            forEachArray(
                targetNode.querySelectorAll('button.ContentItem-more'),
                el => processBtn(el)
            );
        }
    }
    processBtnAll(document);
    observerAddNodes(document.querySelector('.TopstoryMain'), el => processBtnAll(el))
}

function processDetailOrList() {
    setTimeout(function () {
        addCss();
        skipOpenApp();
        bindProcessViewport();
    }, 0);
    setTimeout(function () {
        removeAds();
        removeBlock();
        processAHref(document);

        function stopElePropagation(ele1, selector) {
            if (ele1) {
                forEachArray(ele1.querySelectorAll(selector), function (el) {
                    stopPropagation(el)
                })
            }
        }

        if (inDetailPage) {
            stopElePropagation(document.querySelector('.Question-main'), 'figure img,a')
        } else {
            // list page
            let list_item = document.querySelectorAll('.List-item');
            forEachArray(list_item, function (ele) {
                let ele1 = ele.querySelector('.AnswerItem');
                let zop = ele1 && ele1.dataset && ele1.dataset.zop;
                if (zop) {
                    try {
                        let t = JSON.parse(zop);
                        log('answer_id', t.itemId);
                        if (t.itemId) {
                            load_answer_id_map[t.itemId] = 1;
                        }
                    } catch (e) {
                        console.error(e)
                    }
                }
                processLinkCard(ele.querySelector('.RichContent'));
                stopElePropagation(ele1, 'figure img,a')
            });
        }
        bindLoadData();
    }, 0);
}

function processZvideo() {
    setTimeout(function () {
        observerAddNodes(document.querySelector('.ZVideoRecommendationList'), el => processAHref(el));
    }, 0);
}

function processCommon() {
    let elA = document.querySelector('.QuestionHeader-title a');
    if (elA) {
        stopPropagation(elA)
    }
}


function init() {
    if (init_done) {
        return;
    }
    init_done = 1;
    log('run:init');
    // init
    if (fromMobile) {
        if (questionNumber || inDetailPage) {
            processDetailOrList();
        } else if (inHomePage) {
            processHomePage();
        } else if (inZvideo) {
            processZvideo();
        } else if (inZhuanlan) {
            hideByAddCss('.OpenInAppButton,.KfeCollection-VipRecommendCard')
        }

        setTimeout(function () {
            addCommonStyle();
            processContinue();
            processCommon();
        }, 0);

        setTimeout(function () {
            removeCommonBlock();
        }, 0);
    } else {
        setTimeout(processAllLink, 0);
    }
}


document.onreadystatechange = function () {
    if (document.readyState === "complete") {
        log('document.readyState');
        init()
    }
};
document.addEventListener("DOMContentLoaded", function() {
    log('DOMContentLoaded');
    init()
});