[转载][Javascript]图片滑动切换效果

源码：

```javascript:n
var $ = function (id) {
    return "string" == typeof id ? document.getElementById(id) : id;
};   
console.log("run");
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;
        this.Change=224;
};   
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:      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
        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);
  }   
};   
  
  
//new SlideTrans("idContainer", "idSlider", 3).Run();
  
///////////////////////////////////////////////////////////
  
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", 7, { 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" : ""; })
}   
  
/*$("idAuto").onclick = function(){  
    if(st.Auto){  
        st.Auto = false; st.Stop(); this.value = "自动";  
    }else{  
        st.Auto = true; st.Run(); this.value = "停止";  
    }  
}  
$("idNext").onclick = function(){ st.Next(); }  
$("idPre").onclick = function(){ st.Previous(); }  
 
$("idTween").onchange = function(){  
    switch (parseInt(this.value)){  
        case 2 :  
            st.Tween = Tween.Bounce.easeOut; break;  
        case 1 :  
            st.Tween = Tween.Back.easeOut; break;  
        default :  
            st.Tween = Tween.Quart.easeOut;  
    }  
}*/
  
  
st.Run();   
  
  var touchEvent ={
    startY : 0,   
    endY: 0,   
    ismove:0    
    }   
  
  document.querySelector('#idContainer2').addEventListener("touchstart",function(){
    touchEvent.startX=event.touches[0].pageX;   
    touchEvent.endX=touchEvent.startX;   
    touchEvent.ismove=0;   
    },false);
  
  document.querySelector('#idContainer2').addEventListener("touchmove",function(){
    touchEvent.ismove=1;   
    touchEvent.endX=event.touches[0].pageX;   
  },false);
  
  document.querySelector('#idContainer2').addEventListener("touchend",function(){
    document.querySelector('.show').style.opacity=1;
  
    if(touchEvent.ismove===1){
      if(touchEvent.endX>touchEvent.startX)st.Run(document.querySelector('.on').innerHTML);
         
      else if(touchEvent.endX<touchEvent.startX){
      }   
    }   
  },false);
  
  
  function hide(id){
    temp1=id.substring(0,id.length-1);   
    temp2=id.substring(id.length-1,id.length);   
    if(temp2==="b"){
        document.getElementById(temp1).style.display='none';
    }   
    else{
        for(i=1;i<7;i++){
            document.getElementById('hide'+i).style.display='none';
        }   
  
        document.getElementById(temp1).style.display='block';
    }   
}