慕课倍速播放

调整超星慕课的播放速度

As of 2020-10-17. See the latest version.

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// ==UserScript==
// @name         慕课倍速播放
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  调整超星慕课的播放速度
// @author       You
// @match        https://mooc1-1.chaoxing.com/mycourse/studentstudy?*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var $ = window.$;
    var speed = `
    <div id="control-bar" style="position:fixed;top:10px;left:10px;font-size:14px;border:1px solid black;padding:2px;">
        播放速度
        <input type="number" id="speed-input" min="0.5" step="0.1" value="1">
    </div>`;

    $('html').append(speed);
    $('#speed-input').on('change', function() {

        let firstIframe = document.getElementById('iframe');
        let firstIframeDoc = (firstIframe.contentDocument) ? firstIframe.contentDocument : firstIframe.contentWindow.document;

        let secondIframe = firstIframeDoc.getElementsByClassName("ans-attach-online")[0];
        let secondIframeDoc = (secondIframe.contentDocument) ? secondIframe.contentDocument : secondIframe.contentWindow.document;

        let video = secondIframeDoc.getElementById('video_html5_api');

        video.playbackRate = this.value;
        video.play();
    });
})();