// ==UserScript==
// @name        强制缩放与桌面模式
// @author      酷安@耗子Sky
// @description 竖屏时浏览器ua为手机ua时启用强制缩放，浏览器ua非手机ua时启用桌面模式，横屏时默认桌面模式
// @match       *://*/*
// @grant       none
// @version     4.0
// @run-at      document-end
// @author      -
// @namespace https://greasyfork.org/users/452911
// @downloadURL none
// ==/UserScript==

(()=>{
  const
    竖屏 = 0.4,
    横屏 = 0.7,
    强制缩放 = 1.0,
    网页宽度 = 700,
    meta = document.querySelector('meta[name=viewport]'),
    ori = screen.orientation.type,
    ua = navigator.userAgent;
    
  function changeScale(x) {
    meta.setAttribute(
      'content',
      `width=device-width,initial-scale=${x},maximum-scale=10.0,user-scalable=1`);
  };
  
  function autoChangeScale() {
    if (ori.indexOf('landscape')==0) {
      changeScale(横屏);
    } else {
      if (ua.indexOf('Mobile')<0) {
        changeScale(竖屏);
      } else if (window.innerWidth<网页宽度) {
        changeScale(强制缩放);
      }
    }
  }
  
  // 刚打开
  autoChangeScale();
  
  // 用户改变
  screen.orientation.onchange = autoChangeScale;
  
})();