js realizes the dragging effect of div on the page_javascript skills

The example in this article describes the js implementation of div dragging effect on the page. Share it with everyone for your reference, the details are as follows:

<style type="text/css">
body {
 margin: 0px;
}
#div1 {
 display: none;
 position: absolute;
 z-index: 1000;
 height: 100%;
 width: 100%;
 background: #000000;
 filter:Alpha(opacity=30);
}
#div2 {
 display: none;
 position: absolute;
 height: 100%;
 width: 100%;
 padding-top: 10%;
 z-index: 1001;
}
#div3 {
 display: block;
 position: absolute;
 z-index: 999;
}
</style>
<script type="text/javascript">
//定义移动对象和移动坐标
var Mouse_Obj="none",_x,_y;
//拖动对象函数(自动)
document.onmousemove=function()
{
 if(Mouse_Obj!=="none")
 {
 document.getElementById(Mouse_Obj).style.left=_x+event.x;
 document.getElementById(Mouse_Obj).style.top=_y+event.y;
 event.returnValue=false;
 }
}
//停止拖动函数(自动)
document.onmouseup=function()
{
 Mouse_Obj="none";
}
//确定被拖动对象函数 o为被拖动对象
function m(o)
{
 Mouse_Obj=o;
 _x=parseInt(document.getElementById(Mouse_Obj).style.left)-event.x;
 _y=parseInt(document.getElementById(Mouse_Obj).style.top)-event.y;
}
</script>
<div id="div1"></div>
<div id="div2" onmousedown="m(this.id)" style="left: 0px;top: 0px;">
<table width="50%" border="0" cellpadding="3" cellspacing="1" 
style="background: #ff7300;
position:static;filter:progid:DXImageTransform.Microsoft.DropShadow
(color=#666666,offX=4,offY=4,positives=true)" align="left">
 <tr style="cursor: move;">
  <td><font color="#FFFFFF">温馨提示：</font></td>
  <td align="right"><input type="button" value="ｘ"
onClick="document.getElementById
('div1').style.display='none';document.getElementById
('div2').style.display='none';" style="cursor: hand;"></td>
 </tr>
 <tr>
  <td colspan="2" width="100%" bgcolor="#FFFFFF" height="150"
align="middle">欢迎访问　<a href=""></a></td>
 </tr>
</table>
</div>
<div id="div3"><input type="button" value="打开层"
onClick="document.getElementById
('div1').style.display='block';document.getElementById
('div2').style.display='block';"></div>

Readers who are interested in more JavaScript-related content can check out the special topics on this site: "Summary of JavaScript switching effects and techniques", "Summary of JavaScript search algorithm techniques", "Summary of JavaScript animation special effects and techniques", "Summary of JavaScript errors and debugging skills", "Summary of JavaScript data structures and algorithm techniques", "JavaScript traversal Summary of Algorithms and Techniques" and "Summary of JavaScript Mathematical Operation Usage"

I hope this article will be helpful to everyone in JavaScript programming.