youtube播放视频倍速自定义，可记忆

youtube播放视频倍速自定义，刷新浏览器也不会丢失之前设置的速度
目前为 2022-11-02 提交的版本。查看最新版本。
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// ==UserScript==
// @name         youtube播放视频倍速自定义，可记忆
// @namespace    EsfB3XVPmbThEv39bdxQR2hzid30iMF9
// @version      1.1
// @description  youtube播放视频倍速自定义，刷新浏览器也不会丢失之前设置的速度
// @author       tomoya
// @include      http*://*youtube.com/*
// @grant        none
// ==/UserScript==

(function () {
  'use strict';

  let videoSpeedElement;

  setInterval(function () {
    if (location.href.indexOf("short") > -1) return;
    if (document.querySelector("#above-the-fold") && document.getElementById("video_speed_div") === null) {
      addSpeedBtn();
    }
    setPlaybackRate();
  }, 500);

  function addSpeedBtn() {
    let style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = "#video_speed_div button { outline: 0; padding: 5px 7px; margin-left: 10px; background-color: #ede9e9; border: 0; border-radius: 12px; color: #222; cursor: pointer;} #video_speed_div button:first-child{margin-left:0;} #video_speed_div button:hover{background-color: #e2e0e0;} .video_speed_div-button-active { border: 0!important; background-color: #ff0000!important; color: #fff!important; }";
    document.getElementsByTagName('head').item(0).appendChild(style);

    videoSpeedElement = document.createElement("div");
    videoSpeedElement.setAttribute("id", "video_speed_div");

    let speedArr = [0.5, 1, 1.5, 1.75, 2, 2.5, 3];

    for (let i = 0; i < speedArr.length; i++) {
      let speed = speedArr[i];
      let btn = document.createElement("button");
      btn.innerHTML = "x" + speed;
      btn.style.width = "45px";
      btn.setAttribute("id", "third_video_plugin_btn_" + speed);
      btn.addEventListener("click", changeVideoSpeed);
      videoSpeedElement.appendChild(btn);
    }

    videoSpeedElement.style.width = "300%";
    videoSpeedElement.style.height = "30px";

    // let targetElement = document.querySelectorAll("[id='count']");
    // for (var i = 0; i < targetElement.length; i++) {
    //   if (targetElement[i].className.indexOf("ytd-video-primary-info-renderer") > -1) {
    //     targetElement[i].appendChild(videoSpeedElement);
    //   }
    // }

    let targetElement = document.querySelector("#above-the-fold");
    targetElement.insertBefore(videoSpeedElement, targetElement.firstChild);
  }

  // 加载之前已经设置的速度
  function setPlaybackRate() {
    if (!videoSpeedElement) return;
    let third_video_plugin_speed = localStorage.getItem("third_video_plugin_speed");
    if (!third_video_plugin_speed) third_video_plugin_speed = '1';

    for (let i = 0; i < videoSpeedElement.childNodes.length; i++) {
      let btn = videoSpeedElement.childNodes[i];
      if (btn.getAttribute("id") === "third_video_plugin_btn_" + third_video_plugin_speed) {
        btn.click();
      }
    }
    document.getElementById("third_video_plugin_btn_" + third_video_plugin_speed).click();
  }

  function changeVideoSpeed(e) {
    let speed = parseFloat(e.target.innerHTML.replace("x", ""));
    localStorage.setItem("third_video_plugin_speed", speed);
    let videoDom = document.querySelector(".html5-main-video");
    if (!videoDom) return;
    videoDom.playbackRate = speed;
    for (let i = 0; i < videoSpeedElement.childNodes.length; i++) {
      let btn = videoSpeedElement.childNodes[i];
      btn.setAttribute("class", "");
    }
    e.target.setAttribute("class", "video_speed_div-button-active");
  }

})();
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