一段代码··新手求注释

<SCRIPT type=text/javascript>var $ = function (id) { return "string" == typeof id ? document.getElementById(id) : id;};var Extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; } return destination;}var CurrentStyle = function(element){ return element.currentStyle || document.defaultView.getComputedStyle(element, null);}var Bind = function(object, fun) { var args = Array.prototype.slice.call(arguments).slice(2); return function() { return fun.apply(object, args.concat(Array.prototype.slice.call(arguments))); }}var Tween = { Quart: { easeOut: function(t,b,c,d){ return -c * ((t=t/d-1)*t*t*t - 1) + b; } }, Back: { easeOut: function(t,b,c,d,s){ if (s == undefined) s = 1.70158; return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b; } }, Bounce: { easeOut: function(t,b,c,d){ if ((t/=d) < (1/2.75)) { return c*(7.5625*t*t) + b; } else if (t < (2/2.75)) { return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b; } else if (t < (2.5/2.75)) { return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b; } else { return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b; } } }}//容器对象,滑动对象,切换数量var SlideTrans = function(container, slider, count, options) { this._slider = $(slider); this._container = $(container);//容器对象 this._timer = null;//定时器 this._count = Math.abs(count);//切换数量 this._target = 0;//目标值 this._t = this._b = this._c = 0;//tween参数 this.Index = 0;//当前索引 this.SetOptions(options); this.Auto = !!this.options.Auto; this.Duration = Math.abs(this.options.Duration); this.Time = Math.abs(this.options.Time); this.Pause = Math.abs(this.options.Pause); this.Tween = this.options.Tween; this.onStart = this.options.onStart; this.onFinish = this.options.onFinish; var bVertical = !!this.options.Vertical; this._css = bVertical ? "top" : "left";//方向 //样式设置 var p = CurrentStyle(this._container).position; p == "relative" || p == "absolute" || (this._container.style.position = "relative"); this._container.style.overflow = "hidden"; this._slider.style.position = "absolute"; this.Change = this.options.Change ? this.options.Change : this._slider[bVertical ? "offsetHeight" : "offsetWidth"] / this._count;};SlideTrans.prototype = { //设置默认属性 SetOptions: function(options) { this.options = {//默认值 Vertical: true,//是否垂直方向（方向不能改） Auto: true,//是否自动 Change: 0,//改变量 Duration: 50,//滑动持续时间 Time: 10,//滑动延时 Pause: 4000,//停顿时间(Auto为true时有效) onStart: function(){},//开始转换时执行 onFinish: function(){},//完成转换时执行 Tween: Tween.Quart.easeOut//tween算子 }; Extend(this.options, options || {}); }, //开始切换 Run: function(index) { //修正index index == undefined && (index = this.Index); index < 0 && (index = this._count - 1) || index >= this._count && (index = 0); //设置参数 this._target = -Math.abs(this.Change) * (this.Index = index); this._t = 0; this._b = parseInt(CurrentStyle(this._slider)[this.options.Vertical ? "top" : "left"]); this._c = this._target - this._b; this.onStart(); this.Move(); }, //移动 Move: function() { clearTimeout(this._timer); //未到达目标继续移动否则进行下一次滑动 if (this._c && this._t < this.Duration) { this.MoveTo(Math.round(this.Tween(this._t++, this._b, this._c, this.Duration))); this._timer = setTimeout(Bind(this, this.Move), this.Time); }else{ this.MoveTo(this._target); this.Auto && (this._timer = setTimeout(Bind(this, this.Next), this.Pause)); } }, //移动到 MoveTo: function(i) { this._slider.style[this._css] = i + "px"; }, //下一个 Next: function() { this.Run(++this.Index); }, //上一个 Previous: function() { this.Run(--this.Index); }, //停止 Stop: function() { clearTimeout(this._timer); this.MoveTo(this._target); }};</SCRIPT></head><body style="text-align:center"><DIV id=idContainer2 class=container><TABLE id=idSlider2 border=0 cellSpacing=0 cellPadding=0> <TBODY> <TR> <TD class=td_f><A href="http://www.lanrentuku.com/" target="_blank"><IMG src="images/01.jpg"></A></TD> <TD class=td_f><A href="http://www.lanrentuku.com/" target="_blank"><IMG src="images/02.jpg"></A></TD> <TD class=td_f><A href="http://www.lanrentuku.com/" target="_blank"><IMG src="images/03.jpg"></A></TD> <TD class=td_f><A href="http://www.lanrentuku.com/" target="_blank"><IMG src="images/04.jpg"></A></TD> <TD class=td_f><A href="http://www.lanrentuku.com/" target="_blank"><IMG src="images/05.jpg"></A></TD> </TR></TBODY></TABLE><UL id=idNum class=num></UL></DIV><SCRIPT> var forEach = function(array, callback, thisObject){ if(array.forEach){ array.forEach(callback, thisObject); }else{ for (var i = 0, len = array.length; i < len; i++) { callback.call(thisObject, array[i], i, array); } } } var st = new SlideTrans("idContainer2", "idSlider2", 5, { Vertical: false }); var nums = []; //插入数字 for(var i = 0, n = st._count - 1; i <= n;){ (nums[i] = $("idNum").appendChild(document.createElement("li"))).innerHTML = ++i; } forEach(nums, function(o, i){ o.onmouseover = function(){ o.className = "on"; st.Auto = false; st.Run(i); } o.onmouseout = function(){ o.className = ""; st.Auto = true; st.Run(); } }) //设置按钮样式 st.onStart = function(){ forEach(nums, function(o, i){ o.className = st.Index == i ? "on" : ""; }) } st.Run();</SCRIPT>
很多看不懂··求注释···

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这也叫一段代码？不如用Google把代码翻译成中文看吧
//首先这个一个工厂方法,通常用来获取dom对象.类似于jquery里的$('#...')方法.
//判断传入的是字符串还是其他对象,如果是字符串则返回id为该字符串的dom对象.
var $ = function (id) {    return "string" == typeof id ? document.getElementById(id) : id;};
//这个方法应该叫做属性拷贝吧,遍历source的属性,然后填充的destination里,使destination具有source所有的public属性.
var Extend = function(destination, source) {    for (var property in source) {        destination[property] = source[property];    }    return destination;}
//这个应该还有其他的js文件吧...
var CurrentStyle = function(element){    return element.currentStyle || document.defaultView.getComputedStyle(element, null);}
//一般用于方法注入例如给setTimeOut(fun,seconds,pars)例子:http://blog.csdn.net/xiage/article/details/4252126
var Bind = function(object, fun) {
//截取从第三个参数开始的所有参数
    var args = Array.prototype.slice.call(arguments).slice(2);    return function() {
//把获取的参数传递给传入的函数句柄(fun)
        return fun.apply(object, args.concat(Array.prototype.slice.call(arguments)));    }}
//这个就是定义对象了,具体的业务不解.
var Tween = {    Quart: {        easeOut: function(t,b,c,d){            return -c * ((t=t/d-1)*t*t*t - 1) + b;        }    },    Back: {        easeOut: function(t,b,c,d,s){            if (s == undefined) s = 1.70158;            return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;        }    },    Bounce: {        easeOut: function(t,b,c,d){            if ((t/=d) < (1/2.75)) {                return c*(7.5625*t*t) + b;            } else if (t < (2/2.75)) {                return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;            } else if (t < (2.5/2.75)) {                return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;            } else {                return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;            }        }    }}