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js实现简单div拖拽功能实例_javascript技巧

WBOYOriginal: 2016-05-16 15:59:421073browse

本文实例讲述了js实现简单div拖拽功能的方法。分享给大家供大家参考。具体实现方法如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>拖拽div</title>
<style type="text/css">
div{
 position:absolute;
 width:150px;
 height:150px;
 background-color:#C8FFFF;
}
</style>
<script type="text/javascript">
<!--
function drag(obj)
{
 if (typeof obj == "string") {
 var obj = document.getElementById(obj);
 obj.orig_index=obj.style.zIndex;
 //设置当前对象永远显示在最上层
 }
 obj.onmousedown=function (a){
 //鼠标按下
 this.style.cursor="move";
 //设置鼠标样式
 this.style.zIndex=1000;
  var d=document;
 if(!a) a=window.event;
 //按下时创建一个事件
 var x=a.clientX-document.body.scrollLeft-obj.offsetLeft;
 //x=鼠标相对于网页的x坐标-网页被卷去的宽-待移动对象的左外边距
 var y=a.clientY-document.body.scrollTop-obj.offsetTop;
 //y=鼠标相对于网页的y左边-网页被卷去的高-待移动对象的左上边距
 d.onmousemove=function(a){//鼠标移动
  if(!a) a=window.event;//移动时创建一个事件
  obj.style.left=a.clientX+document.body.scrollLeft-x;
  obj.style.top=a.clientY+document.body.scrollTop-y;
 }
 d.onmouseup=function (){//鼠标放开
  document.onmousemove=null;
  document.onmouseup = null;
  obj.style.cursor="normal";//设置放开的样式
  obj.style.zIndex=obj.orig_index;
 }
 } 
}
-->
</script>
</head>
<body>
<div id="div1"> </div>
<div id="div2" style="left:170px; background-color:#408080"></div>
<script type="text/javascript">
<!--
 drag("div1");
 drag("div2");
-->
</script>
</body>
</html>

希望本文所述对大家的javascript程序设计有所帮助。

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