一段javascript 图层操作

	//移动的图层，拖动 1.<span style='position:absolute;width:200;height:200;background:red' onmousedown=MouseDown(this) onmousemove=MouseMove() onmouseup=MouseUp()>meizz</span> <script language=javascript> var Obj; function MouseDown(obj) {    Obj=obj;    Obj.setCapture();    Obj.l=event.x-Obj.style.pixelLeft;    Obj.t=event.y-Obj.style.pixelTop; } function MouseMove() {   if(Obj!=null)    {      Obj.style.left = event.x-Obj.l;      Obj.style.top = event.y-Obj.t;    } } function MouseUp() {   if(Obj!=null)    {      Obj.releaseCapture();      Obj=null;    } } </script> 2. <div id="myDiv" src="logo.gif" ondrag="doDrag();" onmouseover="this.style.cursor='hand'" style="position:absolute;left=100;top=100;" onmousedown="doMouseDown();"> <a href="#" onclick="return false"><h1>wlecome</h1></a> </div> <script language="JavaScript" type="text/javascript"> var orgMouseX; var orgMouseY; var orgObjX; var orgObjY; function doDrag() { var myObject=document.all.myDiv; var x=event.clientX; var y=event.clientY; myObject.style.left=x-(orgMouseX-orgObjX); myObject.style.top=y-(orgMouseY-orgObjY); } function doMouseDown() { orgMouseX=event.clientX; orgMouseY=event.clientY; orgObjX=parseInt(document.all.myDiv.style.left); orgObjY=parseInt(document.all.myDiv.style.top); } </script> 复制代码