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javascript实现拖动层效果代码(符合标准且兼容IE,chrome,firefox)

时间：2021-07-01 10:21:17 帮助过：7人阅读
实例代码一见：
代码如下:

<!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： 
 
<!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> 
 
1 
2 
3 
4 
5 
6 
 
</body> 
</html> 

  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]

实例代码二见： 

 代码如下:
<!DOCTYPE HTML> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<title>无标题文档</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; //计算鼠标和div边框的距离 
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> 
 

效果： 

 
<!DOCTYPE HTML> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<title>无标题文档</title> 
<style type="text/css"> 
#test{width:200px; height:200px; background:pink; cursor:move; position:absolute; left:100px; top:100px} 
</style> 
</head> 
<body> 
 
<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; //计算鼠标和div边框的距离 
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> 

  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行] 

实例代码三见（拖动把柄）： 

 
<!DOCTYPE HTML> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<title>无标题文档</title> 
<style type="text/css"> 
*{margin:0;padding:0} 
#testBox{ width:300px; height:300px; background:red; position:absolute; left:0; top:0} 
#test{width:200px; height:200px; background:pink; cursor:move; margin:30px} 
</style> 
</head> 
<body> 
 
在这里才能移动 
 
<script type="text/javascript"> 
var obj=document.getElementById("test"); 
var objBox=document.getElementById("testBox"); 
var b; 
obj.onmousedown=function(e){ 
b=true; 
var divLeft=parseFloat(window.getComputedStyle?window.getComputedStyle(objBox,null).left:objBox.currentStyle.left); 
var divTop=parseFloat(window.getComputedStyle?window.getComputedStyle(objBox,null).top:objBox.currentStyle.top); 
var e=e||event; 
var divX=e.clientX-divLeft; //计算鼠标和div边框的距离 
var divY=e.clientY-divTop; 
document.onmousemove=function(e){ 
if(b){ 
var e=e||event; //IE8及以下浏览器得写这句 
objBox.style.left=e.clientX-divX+"px"; 
objBox.style.top=e.clientY-divY+"px"; 
} 
} 
} 
document.onmouseup=function(){ 
b=false; 
} 
</script> 
</body> 
</html> 

  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]
javascript实现拖动层效果代码(符合标准且兼容IE,chrome,firefox)

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