JS实现的相册图片左右滚动完整实例

var $get = 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 = $get(slider);
  this._container = $get(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: false, //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);
  }
};

<!-- Icon scroll begin -->
<div style="text-align:center; width:100%; margin:auto auto">
  <div class="container" id="idContainer" runat="server" >
  </div>
</div>
<!--end-->
<!--左右滚动按钮-->
<div class="defaultprenext">
<table cellpadding=0 cellspacing=0 style="width:100%">
 <tr>
   <td style="width:40%; text-align:left; padding-left:6px">
   <img id="ImgPre" alt="" src="ImageV3/Default/pre-gray.png" />
   <span class="pager" id="Pre" style="color:Gray">Pre</span></td>
   <td style="width:20%; text-align:center">
     <div class="defaultprenextmid">
      <div style="height:10px; vertical-align:middle; line-height:10px">
       <img src="ImageV3/Default/greendot.png" id="Img1" />&nbsp;
        <img src="ImageV3/Default/graydot.png" id="Img2" />&nbsp;
        <img src="ImageV3/Default/graydot.png" id="Img3" />
      </div>
    </div>
   </td>
   <td style="width:40%; text-align:right; padding-right:6px">
    <span class="pager" id="Next" style="color:#2f6417">Next</span>
    <img id="ImgNext" alt="" src="ImageV3/Default/next-green.png" />
   </td>
 </tr>
</table>
</div>

var imgNum = $get("idContainer").getElementsByTagName("img").length;
var pre = $get("Pre");
var next = $get("Next");
var i = 0;
if (imgNum > 0) {
  var st = new SlideTrans("idContainer", "idSlider", 3, { Vertical: false });
  if (i < 2) {
    $get("Next").onclick = function() {
      if (i < 2) {
        st.Next();
        i++;
        if (i == 1) {
          $get("ImgPre").src = "ImageV3/Default/pre-green.png";
          pre.style.color = "#2f6417";
        }
        if (i == 2) {
          $get("ImgNext").src = "ImageV3/Default/next-gray.png";
          next.style.color = "Gray";
        }
        ChangePicIndex(i);
      }
    }
  }
  $get("Pre").onclick = function() {
    if (i > 0) {
      st.Previous();
      $get("ImgNext").src = "ImageV3/Default/next-green.png";
      next.style.color = "#2f6417";
      i--;
      if (i == 0) {
        $get("ImgPre").src = "ImageV3/Default/pre-gray.png";
        pre.style.color = "Gray";
      }
      ChangePicIndex(i);
    }
  }
  st.Run();
}
function ChangePicIndex(index) {
  switch (index) {
    case 1:
      $get("Img1").src = "ImageV3/Default/graydot.png";
      $get("Img2").src = "ImageV3/Default/greendot.png";
      $get("Img3").src = "ImageV3/Default/graydot.png";
      break
    case 2:
      $get("Img1").src = "ImageV3/Default/graydot.png";
      $get("Img2").src = "ImageV3/Default/graydot.png";
      $get("Img3").src = "ImageV3/Default/greendot.png";
      break
    default:
      $get("Img1").src = "ImageV3/Default/greendot.png";
      $get("Img2").src = "ImageV3/Default/graydot.png";
      $get("Img3").src = "ImageV3/Default/graydot.png";
  }
}