下面是代码，里面都有注释，可以直接运行。
在线演示 http://demo.jb51.net/js/2011/js_popup_up/index.htm
代码如下:
<!DOCTYPE>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>lock page</title>
<meta name="author" content="www.planeart.cn" />
<link rel="stylesheet" type="text/css" href="style/css/j_dialog.css" />
<style>
body {padding:0; margin:0; font: 12px/1.5 Tahoma, Helvetica, Arial, sans-serif;}
body, h1, h2, h3, h4, h5, h6, hr, p, blockquote,dl, dt, dd, ul, ol, li,pre,form, fieldset, legend, button, input, textarea,th, td {margin: 0;padding: 0;}
button, input, select, textarea {font: 12px/1.5 tahoma, arial, simsun, sans-serif;}
h1, h2, h3, h4, h5, h6 { font-size: 100%;font-weight:normal; }
address, cite, dfn, em, var { font-style: normal; }
code, kbd, pre, samp { font-family: courier new, courier, monospace; }
small { font-size: 12px; }
ul, ol { list-style: none; }
sup { vertical-align: text-top; }
sub { vertical-align: text-bottom; }
legend { color: #000; }
fieldset, img { border: 0; }
button, input, select, textarea { font-size: 100%; }
table { border-collapse: collapse; border-spacing: 0; }
.clear {clear:both;}
html { overflow:-moz-scrollbars-vertical; }
a { text-decoration: none;}
a:hover { text-decoration: underline;}
#pageOverlay {overflow:hidden;display:none;position:fixed; top:0; left:0; z-index:1987; width:100%; height:100%; background:#000; filter:alpha(opacity=70); opacity:0.7; }
.pageDialog{border: 4px solid #999999;display:none;position:fixed; top:40%; left:50%; z-index:1988;background:#fff;}
.pageDialog h3{padding-left:10px;overflow:hidden;font-size:14px;font-weight:normal;height:25px;line-height:25px;background:#666;color:#fff;zoom:1;}
.pageDialog h3 a{float:right;color:#ddd;display:inline;font-weight:bold;width:20px;text-align:center;margin-right:5px;}
.pageDialog h3 a:hover{ text-decoration: none;color:#fff;}
.pageDialog span{margin:10px;display: block;}
.pageDialog .confirm,.pageDialog .concel{display:inline-block;background:#ccc url(../images/DialogBtn.png) no-repeat;width:45px;height:25px;text-align:center;line-height:25px;font-weight:bold;margin-right:10px;}
.pageDialog .confirm:hover,.pageDialog .concel:hover{ text-decoration: none;}
.pageDialog .confirm{background-position:0 0;color:#000;}
.pageDialog .concel{background-position:-45px 1px;color:#000;display:none;}
.oprate{margin:20px 0 10px 0;text-align:center;}
#test li{display:inline;}
</style>
<script type="text/javascript">
function d_log(contents){
if(!(this instanceof d_log))
return new d_log(contents);
this.title=contents&&contents.title||"系统提示";//默认系统提示
this.con=contents&&contents.con||"";//默认弹出内容为空
this.wrap=contents&&contents.wrapId;//是否为自定义弹出层
this.confirm=contents&&contents.confirm;//是否需要确认按钮
this.wraphide=contents&&contents.wraphide||!1;//是否显示背景遮罩层
this.pos=contents&&contents.pos;//自带左右上下角的定位
if(document.getElementById('pageOverlay')){//公用一个cover层，这样避免冗余标签
this.cover=document.getElementById('pageOverlay');
}else{
this.cover=document.createElement('div');
this.cover.id='pageOverlay';
this.cover.style.display='none';
document.body.appendChild(this.cover);
}
this.dialog=document.createElement('div');//对话框
this.dialog.className='pageDialog';
document.body.appendChild(this.dialog);
this.init();
}
d_log.prototype.init=function(){
var self=this,c_height,l,t;
c_height=document.compatMode!="BackCompat" ? document.documentElement.clientHeight : document.body.clientHeight;
if(self.wrap){//如果有指定显示的层则把它加到弹出层中
self.dialog.appendChild(document.getElementById(self.wrap));
}else{//没有则重新构建一个弹出层
self.dialog.innerHTML='<div style="width:300px;"><h3><a class="d_dialog_close" href="javascript:;">x</a>'+self.title+'</h3>';
self.dialog.innerHTML+=self.con+"<p class='oprate'><a href='javascript:;' class='confirm'>确定</a><a href='javascript:;' class='concel'>取消</a></p></div>";
var _p = self.dialog.getElementsByTagName('p')[0];
if(self.confirm)
_p.lastChild.style.display='inline-block';
addEvent(_p.getElementsByTagName('a')[0],'click',function(){
self.close();
if(self.confirm)eval(self.confirm+'()');
});
addEvent(_p.getElementsByTagName('a')[1],'click',function(){
self.close();
});
addEvent(self.dialog.getElementsByTagName('a')[0],'click',function(){
self.close();
});
}
switch(self.pos){
case 'left-top':
l=0;
t=0;
break;
case 'left-bottom':
l=0;
t=c_height-parseInt(getSize(self.dialog).height);
break;
case 'right-top':
l=document.body.clientWidth-parseInt(getSize(self.dialog).width);
t=0;
break;
case 'right-bottom':
l=document.body.clientWidth-parseInt(getSize(self.dialog).width);
t=c_height-parseInt(getSize(self.dialog).height);
break;
default:
l=(document.body.clientWidth-parseInt(getSize(self.dialog).width))/2;
t=(c_height-parseInt(getSize(self.dialog).height))/2;
}
self.dialog.style.left=l+'px';
self.dialog.style.top=t+'px';
if(!window.XMLHttpRequest){
var body,clone,cover = self.cover;
var iframe = '<iframe width="100%" height="100%" frameborder="0" scrolling="no" style="z-index:1000; position: absolute; left: 0pt; top: 0pt;filter:alpha(opacity=0);"></iframe>';
self.dialog.style.position = 'absolute';
try{
document.execCommand("BackgroundImageCache", false, true);
}catch(e){}
(function(){
body = document.body;
if (body.currentStyle.backgroundAttachment !== "fixed") {
if (body.parentNode.currentStyle.backgroundImage === "none") {
body.parentNode.runtimeStyle.backgroundRepeat = "no-repeat";
body.parentNode.runtimeStyle.backgroundImage = "url(about:blank)";
}
body.style.height='100%';
}
self.layer = document.createElement("<div style='position:absolute;z-index:1990;border:0;padding:0;margin:0;overflow:hidden;background:transparent;top:expression((document).documentElement.scrollTop);left:expression((document).documentElement.scrollLeft);width:expression((document).documentElement.clientWidth);height:expression((document).documentElement.clientHeight);display:none;'>");
})();
clone=self.dialog.cloneNode(true);
document.body.removeChild(self.dialog);
self.layer.appendChild(clone);
self.dialog=clone;
if(self.layer.parentNode!== body )
body.insertBefore(self.layer, body.childNodes[0]);
//self.dialog.innerHTML += iframe;
cover.innerHTML = iframe;
cover.style.cssText='position:absolute;left:expression((document).documentElement.scrollLeft);top:expression((document).documentElement.scrollTop);width:expression((document).documentElement.clientWidth);height:expression((document).documentElement.clientHeight);';
}
}
d_log.prototype.open=function(){
if(this.layer)
this.layer.style.display='block';
this.dialog.style.display='block';
if(!this.wraphide)
this.cover.style.display='block';
}
d_log.prototype.close=function(){
if(this.layer)
this.layer.style.display='none';
this.dialog.style.display='none';
this.cover.style.display='none';
}
function getSize(elem) {//获取元素的宽高，包括隐藏元素的
var width = elem.offsetWidth, height = elem.offsetHeight;
if ( !width && !height ) {
var style = elem.style;
var cssShow ="position:absolute;visibility:hidden;display:block;left:-9999px;top:-9999px;";
var cssBack ="position:"+style.position+";visibility:"+style.visibility+";display:"+style.display+";left:"+style.left+";top:"+style.top;
elem.style.cssText=cssShow;
width = elem.offsetWidth; height = elem.offsetHeight;
elem.style.cssText=cssBack;
}
return { "width": width, "height": height };
}
function addEvent(el,type,fn){ //绑定事件
var self = this;
if(el.attachEvent) {
el['e'+type+fn] = fn; //IE下拷贝元素引用,使this指向el对象而不是window
el[type+fn] = function(){el['e'+type+fn](window.event);}
el.attachEvent('on'+type, el[type+fn]);
}else
el.addEventListener(type, fn, false);
}
</script>
</head>
<body onload="dlg3.open()">
<ol id="test">
<li id="par" style="display:none;"><a id='no1' class="abc ggl" href="javascript:dlg1.open();">点击我试试</a></li>
<li><a href="javascript:dlg2.open();">自定义弹出层</a></li>
<li><a href="javascript:dlg1.open();">自带模态对话框</a></li>
<li><a href="javascript:dlg3.open();">右下角广告</a></li>
</ol>
<div id="result"></div>
<select><option label="1111111111">abcd111</option><option label="222222222">abcd222</option></select>
<div id="owp" style="width:300px;height:200px;">这是第二个测试例子！<a href="javascript:dlg2.close();">x</a></div>
<div id="owp1" style="width:200px;height:100px;">右下角广告<a href="javascript:dlg3.close();">x</a></div>
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</body>
</html>
<script>
//参数con为自带弹出框的内容，confirm为是否需要确认按钮，wraphide是否显示遮罩层，wrap自定义层id
var dlg1=d_log({con:'<span>确定要删除此文件吗？</span>',confirm:'check'});//自动生成的dialog
var dlg2=d_log({wraphide:'hide',wrapId:'owp'});//自定义的dialog
var dlg3=d_log({wraphide:'hide',wrapId:'owp1',pos:'right-bottom'});//pos弹出层的位置
var arr=[1,2,3,4,5,5,6,7,8];
function check(){
alert('test!');
}
</script>
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