jQuery實現中間登錄層隨網頁滾動背景變暗（兼容各種瀏覽器）
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
<style type="text/css">
.mask { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: #000; opacity: 0.5; filter: alpha(opacity=50); display: none; z-index: 99; }
.mess { position: absolute; display: none; width: 250px; height: 100px; border: 1px solid #ccc; background: #ececec; text-align: center; z-index: 101; }
</style>
<script type="text/javascript" src="../jQueryTest/jquery.min.js"></script>
<script type="text/javascript">
var k=false;o=false;
$('body').die().live('mousedown', function () {
if (!k &&!o) {
$('.mask').hide();
$('.mess').hide();
}
});
$(document).ready(function() {
k=false;o=false;
$('.mess').mousemove(function() {
k=true;
});
$('.mess').mouseout(function() {
k=false;
o=false;
// check($(this).parent(), $('.btn1'), $('.btn2'));
});
$('.btn').click(function() {
$('.mask').css({'display': 'block'});
center($('.mess'));
// check($(this).parent(), $('.btn1'), $('.btn2'));
});
// 居中
function center(obj) {
alert(obj);
var screenWidth = $(window).width(), screenHeight = $(window).height(); //當前瀏覽器窗口的 寬高
var scrolltop = $(document).scrollTop();//獲取當前窗口距離頁面頂部高度
var objLeft = (screenWidth - obj.width())/2 ;
var objTop = (screenHeight - obj.height())/2 + scrolltop;
obj.css({left: objLeft + 'px', top: objTop + 'px','display': 'block'});
//瀏覽器窗口大小改變時
$(window).resize(function() {
screenWidth = $(window).width();
screenHeight = $(window).height();
scrolltop = $(document).scrollTop();
objLeft = (screenWidth - obj.width())/2 ;
objTop = (screenHeight - obj.height())/2 + scrolltop;
obj.css({left: objLeft + 'px', top: objTop + 'px','display': 'block'});
});
//瀏覽器有滾動條時的操作、
$(window).scroll(function() {
screenWidth = $(window).width();
screenHeight = $(widow).height();
scrolltop = $(document).scrollTop();
objLeft = (screenWidth - obj.width())/2 ;
objTop = (screenHeight - obj.height())/2 + scrolltop;
obj.css({left: objLeft + 'px', top: objTop + 'px','display': 'block'});
});
}
});
</script>
</head>
<body>
<input type="button" class="btn" value="ok" />
<div>彈出確認框始終位於窗口的中間位置的測試</div>
<div class="mask">
<div class="mess">
<input type="button" value="確定" class="btn1"/>
<input type="button" value="取消"class="btn2"/>
</div>
</div>
<div>
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</div>
</body>
</html>
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