F12 放到 console 直接运行即可

或者油猴添加新脚本

核心去除网页绑定焦点事件代码：

if (!-[1,] && !window.XMLHttpRequest || navigator.userAgent.indexOf("MSIE 8.0") > 0) {
        document.onfocusout = function () {
            return true;
        }
    } else {
        window.onblur = function () {
            return true;
        }
    }

全部功能：

// ==UserScript==
// @name         慕课
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  去除美和易思课堂限制
// @author       mutou
// @match        http://www.51moot.net/*
// @grant        none
// @include      http://www.51moot.net/*
// ==/UserScript==

var interval = setInterval(function() {
    var elementPlayView = document.querySelector(".pv-video");
    if (elementPlayView) {
        if (!- [1, ] && !window.XMLHttpRequest || navigator.userAgent.indexOf("MSIE 8.0") > 0) {
            document.onfocusout = function() {
                return true
            }
        } else {
            window.onblur = function() {
                return true
            }
        }
        var elementBtnPlay = document.querySelector(".pv-controls-left .pv-icon-btn-play");
        if (elementBtnPlay) {
            elementBtnPlay.click()
        }
        if (document.querySelector(".pv-progress-current-bg").style.width == "100%") {
            setTimeout(function() {
                var elmentLi = document.querySelector(".vedio-play-conts-left-chapter-list .active");
                if (elmentLi.nextElementSibling == null) {
                    var elementLastDirectory = elmentLi.parentNode.parentNode.parentNode.nextElementSibling;
                    if (elementLastDirectory != null) {
                        elementLastDirectory.querySelectorAll(".vedio-play-conts-left-chapter-list li")[0].click()
                    } else {
                        clearInterval(interval);
                        alert("本课程已播放完成")
                    }
                } else {
                    elmentLi.nextElementSibling.click()
                }
            },
            3000)
        }
        var elementVolumeon = document.querySelector(".pv-icon-volumeon");
        if (elementVolumeon) {
            elementVolumeon.click()
        }
    }
},
1000);