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

实例代码一见：

复制代码 代码如下:

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效果：

<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 $(o, e) { a = o; b = e.clientX - parseInt(a.style.left); c = e.clientY - parseInt(a.style.top); } </script> <div id="main"> <div style="left:100px;top:100px;background:#fc9;" onmousedown="$(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>
[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：

复制代码 代码如下:

效果：

<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> <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>
[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）：

<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> <div id="testBox"> <div id="test">在这里才能移动</div> </div> <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>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]