// JavaScript Document

<!--//--><![CDATA[//><!--
//功能齐全的JS+CSS图片切换特效 幻灯片
    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:		5,//滑动变化率
            Time:		10,//滑动延时
            Auto:		true,//是否自动转换
            Pause:		2000,//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); }
        };

        var objs = $("idNum").getElementsByTagName("li");

        var tv = new TransformView("idTransformView", "idSlider", 242, 5, {
            onStart : function(){ Each(objs, function(o, i){ o.className = tv.Index == i ? "on" : ""; }) }//按钮样式,修改218为需要的高度
        });

        tv.Start();

        Each(objs, function(o, i){
            o.onmouseover = function(){
                o.className = "on";
                tv.Auto = false;
                tv.Index = i;
                tv.Start();
            }
            o.onmouseout = function(){
                o.className = "";
                tv.Auto = true;
                tv.Start();
            }
        })

    }
//--><!]]>