YouTube Playlist Time

Adds a timestamp of all videos' time combined.
当前为 2015-08-15 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name        YouTube Playlist Time
// @namespace   YouTube Playlist Time
// @description Adds a timestamp of all videos' time combined.
// @author      kriscross07
// @include     *.youtube.com/playlist*
// @version     1.4
// @grant       none
// @run-at      document-start
// ==/UserScript==

addEventListener('DOMContentLoaded',function(){
  var button,span,mins=0,interval=true;

  addControls();
  interval&&setInterval(addControls,100);
  
  function addControls(){
    if(button&&document.contains(button)&&span&&document.contains(span))return;
    
    button&&button.remove();
    span&&span.remove();

    button=document.createElement('button');
    span=document.createElement('span');
    
    button.innerHTML='Update Time';
    button.onclick=updateTime;
    
    button.setAttribute('class','yt-uix-button yt-uix-button-playlist-action yt-uix-button-default yt-uix-button-size-default');
    document.querySelector('.playlist-actions').appendChild(button);
    document.querySelector('.playlist-actions').appendChild(span);
    updateTime();
  }
  function updateTime(){
    var stamps=document.querySelectorAll('.timestamp>span');
    mins=0;
    for(var i=0;i<stamps.length;i++){
      var min=stamps[i].innerHTML.split(':');
      mins+=min[1]>=30?parseInt(min[0])+1:parseInt(min[0]);
    }
    span.innerHTML=mins>60?(mins/60).toFixed(1)+' hours.':mins+' minutes.';
  }
});