js實現的簡練高效拖拽功能樣本,js拖拽樣本

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js實現的簡練高效拖拽功能樣本,js拖拽樣本

本文執行個體講述了js實現的簡練高效拖拽功能。分享給大家供大家參考,具體如下:

運行如下:

具體代碼如下:

<!DOCTYPE HTML><html><head> <meta http-equiv="content-type" charset="utf-8" />  <meta http-equiv="content-type" content="text/html" />  <title>demo</title></head><body><p>aaaaaaaaaaa</p><div id="one" style="height:100px;width:100px;background:red;position:absolute;"></div><script>var odiv=document.getElementById("one");dra(odiv);function dra(obj){  obj.onmousedown=function(e){    var oe=e||window.event;    var $this=this;    var l=oe.clientX-$this.offsetLeft;    var t=oe.clientY-$this.offsetTop;    document.onmousemove=function(e){      var oe=e||window.event;      var ol=oe.clientX-l;      var ot=oe.clientY-t;      if(ol<0) ol=0;      if(ot<0) ot=0;      if(ot>document.documentElement.clientHeight-$this.offsetHeight) ot=document.documentElement.clientHeight-$this.offsetHeight;      if(ol>document.documentElement.clientWidth-$this.offsetWidth) ol=document.documentElement.clientWidth-$this.offsetWidth;      $this.style.left=ol+"px";      $this.style.top=ot+"px";    }    document.onmouseup=function(){      document.onmousemove=null;      document.onmouseup=null;      if($this.releaseCapture) $this.releaseCapture();    }    if($this.setCapture){      $this.setCapture();    }    if(oe.preventDefault) oe.preventDefault();    else oe.returnValue=false;    return false;  }}</script></body></html>

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