// ==UserScript==
// @name 测试
// @namespace http://tampermonkey.net/
// @version 1.0
// @description 测试一下
// @compatible chrome
// @include *://*.edu.cn/*
// @license MIT
// @require https://cdn.jsdelivr.net/npm/jquery@3.2.1/dist/jquery.min.js
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';
    $(document).keydown(function (event) {
            if (event.keyCode == 13) { //13：enter键
                let $td_xf = $("td[aria-describedby='tabGrid_xf']");
                let sum = 0;
                for (let i = 0; i < $td_xf.length; i++) {
                    let xf = $td_xf.eq(i).attr("title");
                    sum += parseFloat(xf);
                }
                console.log("总学分：" + sum);
            }
        });
})();