【B站】B站计算集数时长，调节任意倍速

1. 打开浏览器，任意收藏一个网址，将URL替换为下面的代码并保存
   
   
2. 打开任意B站视频页面，点击这个收藏的网址，即可在页面右边看到如下窗口
   
   

javascript: (function () {
  var hour = 0;
  var minute = 0;
  var second = 0;
  var txt = document.getElementsByClassName("cur-page")[0].innerHTML;
  var page = txt.match(/\/(\d+)/)[1];
  function f1() {
    hour = 0;
    minute = 0;
    second = 0;
    var min = 0;
    var sec = 0;
    if (document.getElementById("divChild")) {
      d.removeChild(document.getElementById("divChild"));
    }
    if (
      parseInt(input1.value) >= 1 &&
      parseInt(input1.value) <= page &&
      parseInt(input2.value) <= page &&
      parseInt(input1.value) <= parseInt(input2.value)
    ) {
      for (
        var i = parseInt(input1.value) - 1;
        i < parseInt(input2.value);
        i++
      ) {
        var time = document.getElementsByClassName("duration")[i].innerHTML;
        var t = time.match(/\d+/g);
        if (t.length == 3) {
          var h = t[0];
          var m = t[1];
          var s = t[2];
        } else {
          var h = 0;
          var m = t[0];
          var s = t[1];
        }
        hour += parseInt(h);
        min += parseInt(m);
        sec += parseInt(s);
      }
      hour += parseInt(min / 60);
      minute = min - parseInt(min / 60) * 60 + parseInt(sec / 60);
      second = sec - parseInt(sec / 60) * 60;
      if (minute >= 60) {
        hour += parseInt(minute / 60);
        minute = minute - parseInt(minute / 60) * 60;
      }
      if (second >= 60) {
        minute = parseInt(second / 60);
        second = second - parseInt(second / 60) * 60;
      }
      if (input3.value != 1) {
        var total = hour * 3600 + minute * 60 + second;
        total = total / input3.value;
        hour = parseInt(total / 3600);
        minute = parseInt((total % 3600) / 60);
        second = total % 60;
      }
      var d1 = document.createElement("div");
      d1.style.cssText = "margin-top:15px";
      d1.setAttribute("id", "divChild");
      d.appendChild(d1);
      var t1 = document.createTextNode(
        "全" +
          (parseInt(input2.value) - parseInt(input1.value) + 1) +
          "集:" +
          hour +
          "时" +
          minute +
          "分" +
          parseInt(second) +
          "秒"
      );
      d1.appendChild(t1);
    } else {
      var d1 = document.createElement("div");
      d1.style.cssText = "margin-top:15px";
      d1.setAttribute("id", "divChild");
      d.appendChild(d1);
      var t1 = document.createTextNode("输入与实际集数不符");
      d1.appendChild(t1);
    }
  }
  function f2() {
    document.querySelector("video").playbackRate = parseFloat(input4.value);
    console.log(parseFloat(input4.value));
  }
  function over() {
    btn.style.backgroundColor = "#E4E4E4";
  }
  function out() {
    btn.style.backgroundColor = "#F4F4F4";
  }
  function over2() {
    btn2.style.backgroundColor = "#E4E4E4";
  }
  function out2() {
    btn2.style.backgroundColor = "#F4F4F4";
  }
  var body = document.body;
  var d = document.createElement("div");
  d.style.cssText =
    "padding-top:15px;width:145px;height:180px;background-color:#F4F4F4;position:absolute;right:55px;top:218px;border:1px solid #00A1D6;color:#00A1D6;z-index:999;text-align:center;font-size:14px";
  body.appendChild(d);
  var d2 = document.createElement("div");
  d.appendChild(d2);
  var t2 = document.createTextNode("第");
  d2.appendChild(t2);
  var input1 = document.createElement("input");
  input1.setAttribute("type", "number");
  input1.style.cssText = "border: 1px solid deepskyblue;width:40px";
  d2.appendChild(input1);
  var t3 = document.createTextNode("集到");
  d2.appendChild(t3);
  var input2 = document.createElement("input");
  input2.setAttribute("type", "number");
  input2.style.cssText = "border: 1px solid deepskyblue;width:40px";
  d2.appendChild(input2);
  var t4 = document.createTextNode("集");
  d2.appendChild(t4);
  var t5 = document.createTextNode("倍速：");
  d2.appendChild(t5);
  var input3 = document.createElement("input");
  input3.setAttribute("type", "number");
  input3.style.cssText =
    "border: 1px solid deepskyblue;width:50px;margin-top:15px;margin-right:10px";
  input3.value = 1;
  d2.appendChild(input3);
  var t6 = document.createTextNode("倍");
  d2.appendChild(t6);
  var btn = document.createElement("input");
  btn.setAttribute("type", "button");
  btn.setAttribute("value", "计算");
  btn.style.cssText =
    "width:50px;margin-top:15px;border: 1px solid #00A1D6;cursor:pointer";
  d.appendChild(btn);
  btn.onclick = f1;
  btn.onmouseover = over;
  btn.onmouseout = out;
  var d3 = document.createElement("div");
  d.appendChild(d3);
  var t7 = document.createTextNode("当前倍速：");
  d3.appendChild(t7);
  var input4 = document.createElement("input");
  input4.setAttribute("type", "number");
  input4.style.cssText =
    "border: 1px solid deepskyblue;width:50px;margin-top:15px;margin-right:10px";
  input4.value = document.querySelector("video").playbackRate;
  d3.appendChild(input4);
  var btn2 = document.createElement("input");
  btn2.setAttribute("type", "button");
  btn2.setAttribute("value", "修改");
  btn2.style.cssText =
    "width:50px;margin-top:15px;border: 1px solid #00A1D6;cursor:pointer";
  d.appendChild(btn2);
  btn2.onclick = f2;
  btn2.onmouseover = over2;
  btn2.onmouseout = out2;
})();

参考

1. 【获取b站分集视频时长】合理安排学习时间
2. 网页版B站上的视频怎么倍速播放? - Sole的回答 - 知乎