Js可拖拽放大的层拖动特效实现方法

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我是靠谱客的博主专一柜子，最近开发中收集的这篇文章主要介绍Js可拖拽放大的层拖动特效实现方法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

本文实例讲述了Js可拖拽放大的层拖动特效实现方法。分享给大家供大家参考。具体实现方法如下：

复制代码代码如下:

<!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=gb2312" />

<title>Js实现层拖动效果，还可以拖拽放大</title>

<style>

*{margin:0;padding:0;}

#zhezhao{

 width:100%;

 height:100%;

 background:#f00;

 filter:alpha(opacity:0);

 opacity:0;

 z-index:9999;

 position:absolute;

 top:0;

 left:0;

 display:none;

}

#div2{

 width:200px;

 height:200px;

 position:relative;

 background:#EEEEEE;

 border:1px solid #f00;

}

#div1{

 width:15px;

 height:15px;

 background:#99CC00;

 position:absolute;

 right:0px;

 bottom:0px;

 cursor:nw-resize;

 overflow:hidden;

 font-size:12px;

 text-align:center;

 line-height:15px;

 color:#FFFFFF;

 float:right;

 z-index:3;

}

#right{

 width:15px;

 height:100%;

 background:#f00;

 float:right;

 position:absolute;

 right:0;

 top:0;

 cursor:e-resize;

 overflow:hidden;

 filter:alpha(opacity:0);

 opacity:0;

 z-index:1;

}

#bottom{

 width:100%;

 height:15px;

 background:#f00;

 position:absolute;

 left:0;

 bottom:0;

 cursor:n-resize;

 overflow:hidden;

 filter:alpha(opacity:0);

 opacity:0;

 z-index:1;

}

#div2 p{

 padding:10px;

 line-height:24px;

 font-size:13px;

 text-indent:24px;

 color:#996600;

}

#div2 h2{

 width:100%;

 height:25px;

 line-height:25px;

 font-size:14px;

 background:#CC9900;

 color:#FFFFFF;

 text-indent:15px;

 cursor:move;

 overflow:hidden;

}

</style>

<script type="text/javascript">

window.onload=function()

{

 var oDiv=document.getElementById("div1");

 var oDiv2=document.getElementById("div2");

 var zhezhao=document.getElementById("zhezhao");

 var h2=oDiv2.getElementsByTagName("h2")[0];

 var right=document.getElementById("right");

 var bottom=document.getElementById("bottom");

 var mouseStart={};

 var divStart={};

 var rightStart={};

 var bottomStart={};

 //往右拽

 right.onmousedown=function(ev)

 {

  var oEvent=ev||event;

  mouseStart.x=oEvent.clientX;

  mouseStart.y=oEvent.clientY;

  rightStart.x=right.offsetLeft;

  if(right.setCapture)

  {

   right.onmousemove=doDrag1;

   right.onmouseup=stopDrag1;

   right.setCapture();

  }

  else

  {

   document.addEventListener("mousemove",doDrag1,true);

   document.addEventListener("mouseup",stopDrag1,true);

  }

 };

 function doDrag1(ev)

 {

  var oEvent=ev||event;

  var l=oEvent.clientX-mouseStart.x+rightStart.x;

  var w=l+oDiv.offsetWidth;

  if(w<oDiv.offsetWidth)

  {

   w=oDiv.offsetWidth;

  }

  else if(w>document.documentElement.clientWidth-oDiv2.offsetLeft)

  {

   w=document.documentElement.clientWidth-oDiv2.offsetLeft-2;

  }

  oDiv2.style.width=w+"px";

 };

 function stopDrag1()

 {

  if(right.releaseCapture)

  {

   right.onmousemove=null;

   right.onmouseup=null;

   right.releaseCapture();

  }

  else

  {

   document.removeEventListener("mousemove",doDrag1,true);

   document.removeEventListener("mouseup",stopDrag1,true);

  }

 };

 //往下拽

 bottom.onmousedown=function(ev)

 {

  var oEvent=ev||event;

  mouseStart.x=oEvent.clientX;

  mouseStart.y=oEvent.clientY;

  bottomStart.y=bottom.offsetTop;

  if(bottom.setCapture)

  {

   bottom.onmousemove=doDrag2;

   bottom.onmouseup=stopDrag2;

   bottom.setCapture();

  }

  else

  {

   document.addEventListener("mousemove",doDrag2,true);

   document.addEventListener("mouseup",stopDrag2,true);

  }

 };

 function doDrag2(ev)

 {

  var oEvent=ev||event;

  var t=oEvent.clientY-mouseStart.y+bottomStart.y;

  var h=t+oDiv.offsetHeight;

  if(h<oDiv.offsetHeight)

  {

   h=oDiv.offsetHeight;

  }

  else if(h>document.documentElement.clientHeight-oDiv2.offsetTop)

  {

   h=document.documentElement.clientHeight-oDiv2.offsetTop-2;

  }

  oDiv2.style.height=h+"px";

 };

 function stopDrag2()

 {

  if(bottom.releaseCapture)

  {

   bottom.onmousemove=null;

   bottom.onmouseup=null;

   bottom.releaseCapture();

  }

  else

  {

   document.removeEventListener("mousemove",doDrag2,true);

   document.removeEventListener("mouseup",stopDrag2,true);

  }

 };

 //往左右同时拽

 oDiv.onmousedown=function(ev)

 {

  var oEvent=ev||event;

  mouseStart.x=oEvent.clientX;

  mouseStart.y=oEvent.clientY;

  divStart.x=oDiv.offsetLeft;

  divStart.y=oDiv.offsetTop;

  if(oDiv.setCapture)

  {

   oDiv.onmousemove=doDrag;

   oDiv.onmouseup=stopDrag;

   oDiv.setCapture();

  }

  else

  {

   document.addEventListener("mousemove",doDrag,true);

   document.addEventListener("mouseup",stopDrag,true);

  }

  zhezhao.style.display='block';

 };

 function doDrag(ev)

 {

  var oEvent=ev||event;

  var l=oEvent.clientX-mouseStart.x+divStart.x;

  var t=oEvent.clientY-mouseStart.y+divStart.y;

  var w=l+oDiv.offsetWidth;

  var h=t+oDiv.offsetHeight;

  if(w<oDiv.offsetWidth)

  {

   w=oDiv.offsetWidth;

  }

  else if(w>document.documentElement.clientWidth-oDiv2.offsetLeft)

  {

   w=document.documentElement.clientWidth-oDiv2.offsetLeft-2;

  }

  if(h<oDiv.offsetHeight)

  {

   h=oDiv.offsetHeight;

  }

  else if(h>document.documentElement.clientHeight-oDiv2.offsetTop)

  {

   h=document.documentElement.clientHeight-oDiv2.offsetTop-2;

  }

  oDiv2.style.width=w+"px";

  oDiv2.style.height=h+"px";

 };

 function stopDrag()

 {

  if(oDiv.releaseCapture)

  {

   oDiv.onmousemove=null;

   oDiv.onmouseup=null;

   oDiv.releaseCapture();

  }

  else

  {

   document.removeEventListener("mousemove",doDrag,true);

   document.removeEventListener("mouseup",stopDrag,true);

  }

  zhezhao.style.display='none';

 };

 //h2完美拖拽

 h2.onmousedown=function(ev)

 {

  var oEvent=ev||event;

  mouseStart.x=oEvent.clientX;

  mouseStart.y=oEvent.clientY;

  divStart.x=oDiv2.offsetLeft;

  divStart.y=oDiv2.offsetTop;

  if(h2.setCapture)

  {

   h2.onmousemove=doDrag3;

   h2.onmouseup=stopDrag3;

   h2.setCapture();

  }

  else

  {

   document.addEventListener("mousemove",doDrag3,true);

   document.addEventListener("mouseup",stopDrag3,true);

  }

  zhezhao.style.display='block';

 };

 function doDrag3(ev)

 {

  var oEvent=ev||event;

  var l=oEvent.clientX-mouseStart.x+divStart.x;

  var t=oEvent.clientY-mouseStart.y+divStart.y;

  if(l<0)

  {

   l=0;

  }

  else if(l>document.documentElement.clientWidth-oDiv2.offsetWidth)

  {

   l=document.documentElement.clientWidth-oDiv2.offsetWidth;

  }

  if(t<0)

  {

   t=0;

  }

  else if(t>document.documentElement.clientHeight-oDiv2.offsetHeight)

  {

   t=document.documentElement.clientHeight-oDiv2.offsetHeight;

  }

  oDiv2.style.left=l+"px";

  oDiv2.style.top=t+"px";

 };

 function stopDrag3()

 {

  if(h2.releaseCapture)

  {

   h2.onmousemove=null;

   h2.onmouseup=null;

   h2.releaseCapture();

  }

  else

  {

   document.removeEventListener("mousemove",doDrag3,true);

   document.removeEventListener("mouseup",stopDrag3,true);

  }

  zhezhao.style.display='none';

 }

};

</script>

</head>

<body>

<div id="div2">

 <div style="width:100%; height:100%; overflow:hidden;">

 <h2>完美的拖拽</h2>

 <p>体验不错的JavaScript网页拖动，除了拖动，还可拖动放大，像Windows窗口一样被放大或缩小，只要按住层的右下角，就可以收放自如的放大或缩小。想使用的朋友，可将代码里的Js封装成类，从外部引入想必更合理些。'</p>

 <div id="right"></div>

 <div id="div1">拖</div>

 <div id="bottom"></div>

 </div>

</div>

<div id="zhezhao"></div>

</body>

</html>