var $get = function(id) {
  return "string" == typeof id "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 "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="/UploadFiles/2021-04-02/pre-gray.png">

下面是改变左右按钮可用状态


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";
  }
}




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