在网页中弹出一个小的警告小窗口，有的网站用到这效果了！希望大家喜欢
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>knowsky.com</title>
<style>
*{ padding:0; margin:0; font-size:12px;}
#bg{background:#000000;opacity: 0.5;-moz-opacity:0.5; filter:alpha(opacity=50); width:100%; height:100%;position:absolute; top:0; left:0}
#info{height:0px; width:0px;top:50%; left:50%;position:absolute; line-height:1.7}
#center{background:#fff;border:1px solid #217AC1; width:300px; height:100px; position:absolute; margin:-50px -150px;}
#center strong{ display:block; padding:2px 5px; background:#EBF4FC; color:#519FEE;}
#center p{padding:10px; text-align:center; color:#1C6FB8;}
</style>
</head>
<body>
<span id="boxs"></span>
<a href="javascript:boxs(1);">点这里测试一下</a>
<script>
function boxs(v){
window.scrollTo(0,0);
var bo = document.getElementsByTagName('body')[0];
var ht = document.getElementsByTagName('html')[0];
var boht = document.getElementById('boxs');
boht.innerHTML = '';
bo.style.height='auto';
bo.style.overflow='auto';
ht.style.height='auto';
if(v == 1){
bo.style.height='100%';
bo.style.overflow='hidden';
ht.style.height='100%';
boht.innerHTML = '<div id="bg"></div><div id="info"><div id="center"><strong>友情提醒：</strong><p><a href="javascript:boxs(0);">关闭knowsky.com</a></p></div></div>';
}
}
</script><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />knowsky.com<br /><br /><br /><br /><br /><br />knowsky.com<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />knowsky.com<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />knowsky.com
<a href="javascript:boxs(1);">点这里测试一下</a>
</body>
</html>