Youtube toggle comments

Makes to Youtube comments click to view rather than always showing them or hiding them
当前为 2015-01-18 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name          Youtube toggle comments
// @description	  Makes to Youtube comments click to view rather than always showing them or hiding them
// @author        Lewis Aron Milne
// @include       http://www.youtube.com/watch*
// @include       https://www.youtube.com/watch*
// @include       http://youtube.com/watch*
// @include       https://youtube.com/watch*
// @run-at        document-end
// @grant none
// @version 0.0.1.20150118002420
// @namespace https://greasyfork.org/users/7439
// ==/UserScript==

var observer = new MutationObserver(function(mutations) {
	var triggerNum = 0;
	mutations.forEach(function(mutation) {
		triggerNum++;
		if (triggerNum <= 1)
		{
			var comments = document.getElementById("watch-discussion");
			var toggleLoc = document.getElementById("watch8-secondary-actions");
			var toggleDiv = document.createElement("div");

			toggleDiv.style.textAlign = "center";
			toggleDiv.innerHTML = "<button id='toggleBtn' class='yt-uix-button yt-uix-button-default'> Show Comments </button>";

			comments.parentNode.insertBefore(toggleDiv, comments);
			comments.style.display = "none";

			var toggleBtn = document.getElementById("toggleBtn")
			toggleBtn.onclick = function()
			{
				if (comments.style.display !== "none")
				{
					comments.style.display = "none";
					toggleBtn.innerHTML = "Show  Comments";
				}
				else
				{
					comments.style.display = "";
					toggleBtn.innerHTML = "Hide Comments";
				} 
			}
		}
	});    
});

observer.observe(document.getElementById("distiller-spinner"), { attributes: true });