var $ = function (id) {
 return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
  create: function() {
 return function() {
   this.initialize.apply(this, arguments);
 }
  }
}

Object.extend = function(destination, source) {
 for (var property in source) {
  destination[property] = source[property];
 }
 return destination;
}

var TransformView = Class.create();
TransformView.prototype = {
  //容器对象,滑动对象,切换参数,切换数量
  initialize: function(container, slider, parameter, count, options) {
 if(parameter <= 0 || count <= 0) return;
 var oContainer = $(container), oSlider = $(slider), oThis = this;

 this.Index = 0;//当前索引
 
 this._timer = null;//定时器
 this._slider = oSlider;//滑动对象
 this._parameter = parameter;//切换参数
 this._count = count || 0;//切换数量
 this._target = 0;//目标参数
 
 this.SetOptions(options);
 
 this.Up = !!this.options.Up;
 this.Step = Math.abs(this.options.Step);
 this.Time = Math.abs(this.options.Time);
 this.Auto = !!this.options.Auto;
 this.Pause = Math.abs(this.options.Pause);
 this.onStart = this.options.onStart;
 this.onFinish = this.options.onFinish;
 
 oContainer.style.overflow = "hidden";
 oContainer.style.position = "relative";
 
 oSlider.style.position = "absolute";
 oSlider.style.top = oSlider.style.left = 0;
  },
  //设置默认属性
  SetOptions: function(options) {
 this.options = {//默认值
  Up:   true,//是否向上(否则向左)
  Step:  7,//滑动变化率
  Time:  35,//滑动延时
  Auto:  true,//是否自动转换
  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
 };
 Object.extend(this.options, options || {});
  },
  //开始切换设置
  Start: function() {
 if(this.Index < 0){
  this.Index = this._count - 1;
 } else if (this.Index >= this._count){ this.Index = 0; }
 
 this._target = -1 * this._parameter * this.Index;
 this.onStart();
 this.Move();
  },
  //移动
  Move: function() {
 clearTimeout(this._timer);
 var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);
 
 if (iStep != 0) {
  this._slider.style[style] = (iNow + iStep) + "px";
  this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);
 } else {
  this._slider.style[style] = this._target + "px";
  this.onFinish();
  if (this.Auto) { this._timer = setTimeout(function(){ oThis.Index++; oThis.Start(); }, this.Pause); }
 }
  },
  //获取步长
  GetStep: function(iTarget, iNow) {
 var iStep = (iTarget - iNow) / this.Step;
 if (iStep == 0) return 0;
 if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);
 return iStep;
  },
  //停止
  Stop: function(iTarget, iNow) {
 clearTimeout(this._timer);
 this._slider.style[this.Up ? "top" : "left"] = this._target + "px";
  }
};

window.onload=function(){
 function Each(list, fun){
  for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
 };
 
 
 ////////////////////////test2
 
 var objs2 = $("idNum12").getElementsByTagName("li");
 
 var tv2 = new TransformView("idTransformView2", "idSlider2", 425, 4, {
  onStart: function(){ Each(objs2, function(o, i){ o.className = tv2.Index == i ? "on" : ""; }) },//按钮样式
  Up: false
 });
 
 tv2.Start();
 
 Each(objs2, function(o, i){
  o.onmouseover = function(){
   o.className = "on";
   tv2.Auto = false;
   tv2.Index = i;
   tv2.Start();
  }
  o.onmouseout = function(){
   o.className = "";
   tv2.Auto = true;
   tv2.Start();
  }
 })
 
 
 
}