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Javascript Pop-up Layer Center effect

Source: Internet
Author: User
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The code is as follows Copy Code
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 ">
<title>javascript Pop-up Layer Center </title>

<script type= "Text/javascript" >
Window.onload = Show_center; Page finishes loading trigger event
OnResize = Show_center; Trigger event when browser changes size


function Show_center () {

var body_width = document.body.clientWidth;
var body_height = document.body.clientHeight;
var div_width = document.getElementById ("Show_center"). clientwidth;
var div_height = document.getElementById ("Show_center"). clientwidth;

var div_left = (body_width-div_width)/2;
var div_top = (body_height-div_height)/2;

if (body_height <= div_height) {div_top = 0;}
if (body_width <= div_width) {div_left = 0;}
document.getElementById ("Show_center"). Style.left = div_left + ' px ';
document.getElementById ("Show_center"). Style.top = div_top + ' px ';
}
</script>
<body style= "Background-color: #666" >
<div id= "Show_center" style= "Position:absolute;width:200px;height:100px;background-color: #000; Color: #fff; border:2px solid #fff "> Center display </div
</body>

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