js弹出图层锁定页面

方法1

<SCRIPT language="javascript">
<!--
function lock(menu)       //锁定函数
{menu.style.display="none"?'':''; //打开蒙版
document.cookie="lock=yes";   //设置cookies,使锁定长期有效,
lockpwd.focus();        //密码框直接获取焦点
}

function unlock(menu) //解锁函数
{
menu.style.display=""?'none':'none'; //去除蒙版,达到解锁
document.cookie="lock=no"; //设置cookie
return false;
}

方法2

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="gb2312" >
<script>
function _debug(msg)
{
alert(msg);
document.getElementById('search').focus();
}
</script>

<head οnlοad="javascript:_debug(aa);">
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="author" content="Smiling Dolphin" />
<meta name="keywords" content="design, css, cascading, style, sheets, xhtml, graphic design, w3c, web standards, visual, display, java, javascript, c++, php, jsp, asp, py, pl" />
<meta name="description" content="my favorites language." />
<meta name="robots" content="all" />
<title>Dolphin Document</title>
</head>
<body>
<input type="button" value="显示Alert" οnclick="alert('我改写了Alert显示的样式')" />
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<input name = "search" id="search" type="text" />
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<p>abc</p>
<script language="javascript" type="text/javascript">
window.alert = function(txt)
{
//document.write(txt);
var shield = document.createElement("DIV");
shield.style.position = "absolute";
shield.style.left = "0px";
// shield.id = "shield";
shield.style.top = "0px";
shield.style.width = "100%";
shield.style.height = document.body.clientHeight+"px";
shield.style.background = "#333";
shield.style.textAlign = "center";
// shield.style.lineHeight = document.body.clientHeight+"px";
shield.style.zIndex = "1";
shield.style.filter = "alpha(opacity=0)";
var alertFram = document.createElement("DIV");
alertFram.style.position = "absolute";
alertFram.style.left = "50%";
alertFram.style.top = "50%";
alertFram.style.marginLeft = "-225px";
alertFram.style.marginTop = "-75px";
alertFram.style.width = "450px";
alertFram.style.height = "150px";
alertFram.style.background = "#ccc";
alertFram.style.textAlign = "center";
alertFram.style.lineHeight = "150px";
alertFram.style.zIndex = "2";
strHtml = "<ul style=/"list-style:none;margin:0px;padding:0px;width:100%/">/n";
strHtml += " <li style=/"background:#DD828D;text-align:left;padding-left:20px;font-weight:bold;height:25px;line-height:25px;border:1px solid #F9CADE;/">[系统提示]</li>/n";
strHtml += " <li style=/"background:#fff;text-align:center;font-weight:bold;height:120px;line-height:120px;border-left:1px solid #F9CADE;border-right:1px solid #F9CADE;/">"+txt+"</li>/n";
strHtml += " <li style=/"background:#FDEEF4;text-align:center;font-weight:bold;height:25px;line-height:25px; border:1px solid #F9CADE;/"><input type=/"button/" value=/"确定/" οnclick=/"doOk()/" /></li>/n";
strHtml += "</ul>/n";
alertFram.innerHTML = strHtml;
document.body.appendChild(alertFram);
document.body.appendChild(shield);
var c = 0;
this.doAlpha = function(){
if (c++ > 10){clearInterval(ad);return 0;}
shield.style.filter = "alpha(opacity="+c+");";
}
var ad = setInterval("doAlpha()",20);
this.doOk = function(){
alertFram.style.display = "none";
shield.style.display = "none";
}
}
</script>

</body>
</html>

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