javascript实现拖动层效果代码(许愿墙)

原理：javascript实现拖动层，原理很简单，就是根据鼠标的位置实时设置层的left和top

效果图如下：

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>javascript实现拖动层效果代码(许愿墙)</title> 
<style> 
#main div{
width: 220px;
height:150px;
bordre: 1px solid #999;
position: absolute;
}
</style> 
<script>
var a;
document.onmouseup = function(){
	if(!a)return;
	a="";
}
document.onmousemove = function(d){//鼠标每动一下的事件
	if(!a)return;
	d = d||event;
	a.style.left = (d.clientX-b)+"px";
	a.style.top = (d.clientY-c)+"px";
}
function $(o,e){
	a=o;
	b=e.clientX-parseInt(a.style.left);
	c=e.clientY-parseInt(a.style.top);
}
</script>
</head> 
<body> 
<div id="main">
<div style="left:100px;top:100px;background:#fc9;" onmousedown="$(this,event)">1</div>
<div style="left:400px;top:100px;background:#9cf;" onmousedown="$(this,event)">2</div>
<div style="left:700px;top:100px;background:#f9c;" onmousedown="$(this,event)">3</div>
<div style="left:100px;top:300px;background:#9fc;" onmousedown="$(this,event)">4</div>
<div style="left:400px;top:300px;background:#cf9;" onmousedown="$(this,event)">5</div>
<div style="left:700px;top:300px;background:#c9f;" onmousedown="$(this,event)">6</div>
</div>
</body> 
</html>

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