JS实现可展开折叠层的鼠标拖曳效果

本文实例讲述了JS实现可展开折叠层的鼠标拖曳效果。分享给大家供大家参考。具体如下：

这是一款简单JS代码实现的鼠标拖曳图层效果，比较精简，大家参考一下。鼠标点击层标题栏可实现层内容的展开与折叠，按住标题栏可实现层的拖动。

运行效果截图如下：

在线演示地址如下：

http://demo.jb51.net/js/2015/js-fade-out-mouse-draw-style-demo/

具体代码如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
 <title>鼠标拖曳</title>
 </head>
 <body>
 <script type="text/javascript">
 function drag(elementToDrag,event){
  var startX=event.clientX,startY=event.clientY;
  var origX=elementToDrag.offsetLeft,origY=elementToDrag.offsetTop;
  var deltaX=startX-origX,deltaY=startY-origY;
  if(document.addEventListener){
    document.addEventListener("mousemove",moveHandler,true);
  document.addEventListener("mouseup",upHandler,true);
 }
 else{
  elementToDrag.setCapture();
  elementToDrag.attachEvent("onmousemove",moveHandler);
  elementToDrag.attachEvent("onmouseup",upHandler);
  elementToDrag.attachEvent("onlosecapture",upHandler);
 }
 if(event.stopPropagation) event.stopPropagation();
 else event.cancelBubble=true;
 if(event.preventDefault) event.preventDefault();
 else event.returnValue=false;
 function moveHandler(e){
  if(!e) e=window.event;
  elementToDrag.style.left=(e.clientX-deltaX)+"px";
  elementToDrag.style.top=(e.clientY-deltaY)+"px";
  elementToDrag.style.zIndex="10";
  elementToDrag.getElementsByTagName("p")[0].innerHTML="clientX:"+e.clientX+"</br>"+"clientY:"+e.clientY+"</br>"+"offsetLeft:"+origX+"</br>"+"offsetTop:"+origY+"</br>"+"clientX-offsetLeft:"+deltaX+"</br>"+"clientY-offsetTop:"+deltaY+"</br>";
  if(e.stopPropagation) e.stopPropagation();
  else e.cancelBubble = true;
 }
 function upHandler(e){
  if(!e) e=window.event;
   elementToDrag.style.zIndex="1";
  if(document.removeEventListener){
   document.removeEventListener("mouseup",upHandler,true);
  document.removeEventListener("mousemove",moveHandler,true);
  }
  else{
   elementToDrag.detachEvent("onlosecapture",upHandler);
  elementToDrag.detachEvent("onmouseup",upHandler);
  elementToDrag.detachEvent("onmousemove",moveHandler);
  elementToDrag.releaseCapture();
  }
  if(e.stopPropagation) e.stopPropagation();
  else e.cancelBubble=true;
 }
 }
 </script>
 <div style="position:absolute;left:100px;top:100px;width:250px;background-color:#789;border:1px solid #f00">
  <div style="background:#ccc;border-bottom:dotted black;padding:3px;font-weight:bold" onmousedown="drag(this.parentNode,event)">Drag Me1</div>
 <p>test</p>
 </div>
  <div style="position:absolute;left:100px;top:200px;width:250px;background-color:#789;border:1px solid #f00">
  <div style="background:#ccc;border-bottom:dotted black;padding:3px;font-weight:bold" onmousedown="drag(this.parentNode,event)">Drag Me2</div>
 <p>test</p>
 </div>
  <div style="position:absolute;left:100px;top:300px;width:250px;background-color:#789;border:1px solid #f00">
  <div style="background:#ccc;border-bottom:dotted black;padding:3px;font-weight:bold" onmousedown="drag(this.parentNode,event)">Drag Me3</div>
 <p>test</p>
 </div>
 </body>
</html>

希望本文所述对大家的JavaScript程序设计有所帮助。