js代码找高手写注释

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javascript 类
长得好像一个图片查看的东西
Bind 绑定事件，出了这个我看没有别可以解释的了，楼主，其余的都比较好理解
RevealTrans.prototype = {//这一句是什么意思？。prototype有什么效果？
  initialize: function(container, options) {initialize：function()和function initialize()有什么不同？
    this._img = document.createElement("img");
    this._a = document.createElement("a");
这是一个网页图片PPT效果的js代码，
prototype是定义对象的原型属性举个例子，
//对于String对象它正常情况下是没有hello方法的
String.prototype.hello = function(){
return "hello "+this;
};
alert("tom".hello());
alert("lili".hello());
//凡是String类型的对象都具有hello方法了
前面也可以写成
String.prototype = {
hello : function(){
return "hello "+this;
}
}
感谢 lihui_shine  让我离完全理解这个js又近了一步！
this._img = document.createElement("img");
this的作用是什么？直接用 _img = document.createElement("img");不可用吗？
this的意思是否和Java里面的用法一样？
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>图片切换效果</title>
</head>
<body>
<style type="text/css">
.container{
width:280px;
height:200px;
border:1px solid #eee;
position:relative;
}
#idPicText{
background:#eee;
line-height:25px;
text-align:center;
font-weight:bold;
width:282px;
white-space:nowrap;
overflow:hidden;
font-size:12px;
}
#idPicText a{
text-decoration:none;
color:#333;
display:block;
}
#idPicList img{
cursor:pointer;
width:65px;
height:50px;
filter:alpha(opacity=50);
-moz-opacity: .5;
opacity: .5;
border:0;
margin:10px;
}
#idPicList img.on{
filter:alpha(opacity=100);
-moz-opacity: 1;
opacity: 1;
}#idNum{ position:absolute; right:5px; bottom:5px;}
#idNum li{
float: left;
list-style:none;
color: #fff;
text-align: center;
line-height: 16px;
width: 16px;
height: 16px;
font-family: Arial;
font-size: 12px;
cursor: pointer;
margin: 1px;
border: 1px solid #707070;
background-color: #060a0b;
}
#idNum li.on{
line-height: 18px;
width: 18px;
height: 18px;
font-size: 14px;
border: 0;
background-color: #ce0609;
font-weight: bold;
}</style>
<script type="text/javascript">
var isIE = (document.all) ? true : false;var $ = function (id) {
return "string" == typeof id ? document.getElementById(id) : id;
};var Class = {
create: function() {
return function() { this.initialize.apply(this, arguments); }
}
}var Extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
}var Bind = function(object, fun) {
return function() {
return fun.apply(object, arguments);
}
}var Each = function(list, fun){
for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};
//ie only
var RevealTrans = Class.create();
RevealTrans.prototype = {
  initialize: function(container, options) {
this._img = document.createElement("img");
this._a = document.createElement("a");

this._timer = null;//计时器
this.Index = 0;//显示索引
this._onIndex = -1;//当前索引

this.SetOptions(options);

this.Auto = !!this.options.Auto;
this.Pause = Math.abs(this.options.Pause);
this.Duration = Math.abs(this.options.Duration);
this.Transition = parseInt(this.options.Transition);
this.List = this.options.List;
this.onShow = this.options.onShow;

//初始化显示区域
this._img.style.visibility = "hidden";//第一次变换时不显示红x图
this._img.style.width = this._img.style.height = "100%"; this._img.style.border = 0;
this._img.onmouseover = Bind(this, this.Stop);
this._img.onmouseout = Bind(this, this.Start);
isIE && (this._img.style.filter = "revealTrans()");

this._a.target = "_blank";

$(container).appendChild(this._a).appendChild(this._img);
  },
  //设置默认属性
  SetOptions: function(options) {
this.options = {//默认值
Auto: true,//是否自动切换
Pause: 1000,//停顿时间(微妙)
Duration: 1,//变换持续时间(秒)
Transition: 23,//变换效果(23为随机)
List: [],//数据集合,如果这里不设置可以用Add方法添加
onShow: function(){}//变换时执行
};
Extend(this.options, options || {});
  },
  Start: function() {
clearTimeout(this._timer);
//如果没有数据就返回
if(!this.List.length) return;
//修正Index
if(this.Index < 0 || this.Index >= this.List.length){ this.Index = 0; }
//如果当前索引不是显示索引就设置显示
if(this._onIndex != this.Index){ this._onIndex = this.Index; this.Show(this.List[this.Index]); }
//如果要自动切换
if(this.Auto){
this._timer = setTimeout(Bind(this, function(){ this.Index++; this.Start(); }), this.Duration * 1000 + this.Pause);
}
  },
  //显示
  Show: function(list) {
if(isIE){
//设置变换参数
with(this._img.filters.revealTrans){
Transition = this.Transition; Duration = this.Duration; apply(); play();
}
}
this._img.style.visibility = "";
//设置图片属性
this._img.src = list.img; this._img.alt = list.text;
//设置链接
!!list["url"] ? (this._a.href = list["url"]) : this._a.removeAttribute("href");
//附加函数
this.onShow();
  },
  //添加变换对象
  Add: function(sIimg, sText, sUrl) {
this.List.push({ img: sIimg, text: sText, url: sUrl });
  },
  //停止
  Stop: function() {
clearTimeout(this._timer);
  }
};
</script><div id="idShow" class="container">
</div><div id="idPicShow" class="container">
  <ul id="idNum">
  </ul>
</div>
<div id="idPicText"></div>
<div id="idPicList"></div><script>
var r = new RevealTrans("idShow");//添加变换对象
r.Add('http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_1.jpg', '图片变换效果', 'http://www.cnblogs.com/cloudgamer/archive/2008/05/23/1205642.html');
r.Add('http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_2.jpg', '图片滑动展示效果', 'http://www.cnblogs.com/cloudgamer/archive/2008/05/13/1194272.html');
r.Add('http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_3.jpg', '图片切换展示效果', 'http://www.cnblogs.com/cloudgamer/archive/2008/07/06/1236770.html');r.Start();//////////////////////var rvt = new RevealTrans("idPicShow");//添加变换对象
rvt.Add('http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_1.jpg', '图片变换效果', 'http://www.cnblogs.com/cloudgamer/archive/2008/05/23/1205642.html');
rvt.Add('http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_2.jpg', '图片滑动展示效果', 'http://www.cnblogs.com/cloudgamer/archive/2008/05/13/1194272.html');
rvt.Add('http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_3.jpg', '图片切换展示效果', 'http://www.cnblogs.com/cloudgamer/archive/2008/07/06/1236770.html');
var oList = $("idPicList"), oText = $("idPicText"), arrImg = [];var oNum = $("idNum"), arrNum = [];//设置图片列表
Each(rvt.List, function(list, i){
//图片式
var img = document.createElement("img");
img.src = list["img"]; img.alt = list["text"];
arrImg[i] = img;
oList.appendChild(img);
//按钮式
var li = document.createElement("li");
li.innerHTML = i + 1;
arrNum[i] = li;
oNum.appendChild(li);
//事件设置
img.onmouseover = li.onmouseover = function(){ rvt.Auto = false; rvt.Index = i; rvt.Start(); };
img.onmouseout = li.onmouseout = function(){ rvt.Auto = true; rvt.Start(); };
});//设置图片列表样式文本显示区域
rvt.onShow = function(){
var i = this.Index, list = this.List[i];
//图片式
Each(arrImg, function(o){ o.className = ""; }); arrImg[i].className = "on";
//按钮式
Each(arrNum, function(o){ o.className = ""; }); arrNum[i].className = "on";
//文本区域
oText.innerHTML = !!list.url ? "<a href='" + list.url + "' target='_blank'>" + list.text + "</a>" : list.text;
}//文本显示区域
oText.onmouseover = function(){ rvt.Auto = false; rvt.Stop(); };
oText.onmouseout = function(){ rvt.Auto = true; rvt.Start(); };rvt.Start();</script>
</body>
</html>
http://www.cnblogs.com/cloudgamer/archive/2008/07/06/1236770.html
这个网站不是有注释吗？