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javascript實(shí)現(xiàn)拖動(dòng)層效果代碼(符合標(biāo)準(zhǔn)且兼容IE,chrome,firefox)

更新時(shí)間：2013年06月05日 00:40:51 作者：

javascript實(shí)現(xiàn)拖動(dòng)層，原理很簡(jiǎn)單，就是根據(jù)鼠標(biāo)的位置實(shí)時(shí)設(shè)置層的left和top

實(shí)例代碼一見(jiàn)：

 
<!DOCTYPE HTML> 
<html> 
<head> 
<style type="text/css"> 
#main div{position:absolute;width:220px;height:150px;border:1px solid #999;} 
</style> 
<script type="text/javascript"> 
var a; 
document.onmouseup = function() { 
if (!a) return; 
a = ""; 
}; 
document.onmousemove = function(d) { 
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="$(this,event)">4</div> 
<div style="left:400px;top:300px;background:#c9f;" onmousedown="$(this,event)">5</div> 
<div style="left:700px;top:300px;background:#cf9;" onmousedown="$(this,event)">6</div> 
</div> 
</body> 
</html> 

效果：

[Ctrl+A 全選注:引入外部Js需再刷新一下頁(yè)面才能執(zhí)行]

實(shí)例代碼二見(jiàn)：

復(fù)制代碼代碼如下:

 
<!DOCTYPE HTML> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<title>無(wú)標(biāo)題文檔</title> 
<style type="text/css"> 
#test{width:200px; height:200px; background:pink; cursor:move; position:absolute; left:100px; top:100px} 
</style> 
</head> 
<body> 
<div id="test"></div> 
<script type="text/javascript"> 
var obj=document.getElementById("test"); 
var b; 
obj.onmousedown=function(e){ 
b=true; 
var divLeft=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).left:obj.currentStyle.left); 
var divTop=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).top:obj.currentStyle.top); 
var e=e||event; 
var divX=e.clientX-divLeft; //計(jì)算鼠標(biāo)和div邊框的距離 
var divY=e.clientY-divTop; 
document.onmousemove=function(e){ 
if(b){ 
var e=e||event; //兼容IE8及以下 
obj.style.left=e.clientX-divX+"px"; 
obj.style.top=e.clientY-divY+"px"; 
} 
} 
} 
document.onmouseup=function(){ 
b=false; 
} 
</script> 
</body> 
</html> 