JavaScript拖动层Div代码

效果图：（灰色区域可拖动）

代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{ margin:0; padding:0;} .div{ width:100px; height:100px; position:absolute;left:100px; top:100px; background:#ccc;}
</style>
</head>
<body>
 <div class="div">
 </div>
 <script type="text/javascript">
  var div = document.getElementsByTagName('div')[0];
  var zIndex = 6;
  drag(div);
  div.ondblclick = function() {
  alert("ok");
  };
  function drag(oDrag) {
  var disX = dixY = 0;
  oDrag.onmousedown = function(event) {
   var event = event || window.event;
   disX = event.clientX - this.offsetLeft;
   disY = event.clientY - this.offsetTop;
   var oTemp = this.cloneNode(true);
   document.body.appendChild(oTemp);
   document.onmousemove = function(event) {
   var event = event || window.event;
   var iL = event.clientX - disX;
   var iT = event.clientY - disY;
   var maxL = document.documentElement.clientWidth - oDrag.offsetWidth;
   var maxT = document.documentElement.clientHeight - oDrag.offsetHeight;
   iL <= 0 && (iL = 0);
   iT <= 0 && (iT = 0);
   iL >= maxL && (iL = maxL);
   iT >= maxT && (iT = maxT);
   oTemp.style.zIndex = zIndex++;
   oTemp.style.opacity = "0.5";
   oTemp.style.filter = "alpha(opacity=50)";
   oTemp.style.left = iL + "px";
   oTemp.style.top = iT + "px";
   return false;
   };
   document.onmouseup = function() {
   document.onmousemove = null;
   document.onmouseup = null;
   oDrag.style.opacity = oTemp.style.opacity;
   var arr = {
    left: oTemp.offsetLeft,
    top: oTemp.offsetTop
   };
   oDrag.style.zIndex = oTemp.style.zIndex;
   oAnimate(oDrag, arr, 300,
   function() {
    document.body.removeChild(oTemp);
   });
   oDrag.releaseCapture && oDrag.releaseCapture()
   };

   this.setCapture && this.setCapture();
   return false
  }
  }
  function oAnimate(obj, params, time, handler) {
  var node = typeof obj == "string" ? $(obj) : obj;
  var _style = node.currentStyle ? node.currentStyle: window.getComputedStyle(node, null);
  var handleFlag = true;
  for (var p in params) { (function() {
   var n = p;
   if (n == "left" || n == "top") {
    var _old = parseInt(_style[n]);
    var _new = parseInt(params[n]);
    var _length = 0,
    _tt = 10;
    if (!isNaN(_old)) {
    var count = _old;
    var length = _old <= _new ? (_new - _old) : (_old - _new);
    var speed = length / time * _tt;
    var flag = 0;
    var anim = setInterval(function() {
     node.style[n] = count + "px";
     count = _old <= _new ? count + speed: count - speed;
     flag += _tt;
     if (flag >= time) {
     node.style[n] = _new + "px";
     clearInterval(anim);
     if (handleFlag) {
      handler();
      handleFlag = false;
     }
     }
    },
    _tt);
    }

   }
   })();
  }
  }
 </script>
 </body>
</html>

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