<div id="main"><a href="javascript:showBg();">點(diǎn)擊這里查看效果</a> <div id="fullbg"></div> <div id="dialog"> <p class="close"><a href="#" onclick="closeBg();">封閉</a></p> <div>正在加載，請(qǐng)稍后....</div> </div></div>

 body { font-family:Arial, Helvetica, sans-serif; font-size:12px; margin:0;}#main { height:1800px; padding-top:90px; text-align:center;}#fullbg { bac千克round-color:gray; left:0; opacity:0.5; position:absolute; top:0; z-index:3; filter:alpha(opacity=50); -moz-opacity:0.5; -khtml-opacity:0.5;}#dialog { bac公斤round-color:#fff; border:5px solid rgba(0,0,0, 0.4); height:400px; left:50%; margin:-200px 0 0 -200px; padding:1px; position:fixed !important; /* 浮動(dòng)對(duì)話框 */ position:absolute; top:50%; width:400px; z-index:5; border-radius:5px; display:none;}#dialog p { margin:0 0 12px; height:24px; line-height:24px; bac公斤round:#CCCCCC;}#dialog p.close { text-align:right; padding-right:10px;}#dialog p.close a { color:#fff; text-decoration:none;}

<script type="text/javascript"> //展示灰色 jQuery 遮罩層 function showBg() { var bh = $("body").height(); var bw = $("body").width(); $("#fullbg").css({  height:bh,  width:bw,  display:"block" }); $("#dialog").show(); } //關(guān)閉灰色 jQuery 遮罩 function closeBg() { $("#fullbg,#dialog").hide(); } </script>

<p class="showbtn"><a href="javascript:void(0);">顯示遮罩層</a></p><div id="bg"></div><div class="box" style="display:none"> <h2>jQuery 學(xué)習(xí)交流<a href="#" class="close">關(guān)閉</a></h2> <div class="list"> <ul>  <li>武林網(wǎng)</li>  <li>武林網(wǎng)</li>  <li>武林網(wǎng)</li> </ul> </div></div>

/* box */.box{position:absolute;width:600px;left:50%;height:auto;z-index:100;background-color:#fff;border:1px #ddd solid;padding:1px;}.box h2{height:25px;font-size:14px;background-color:#aaa;position:relative;padding-left:10px;line-height:25px;color:#fff;}.box h2 a{position:absolute;right:5px;font-size:12px;color:#fff;}.box .list{padding:10px;}.box .list li{height:24px;line-height:24px;}.box .list li span{margin:0 5px 0 0;font-family:"宋體";font-size:12px;font-weight:400;color:#ddd;}.showbtn {font:bold 24px '微軟雅黑';}#bg{background-color:#666;position:absolute;z-index:99;left:0;top:0;display:none;width:100%;height:100%;opacity:0.5;filter: alpha(opacity=50);-moz-opacity: 0.5;}

$(function () { $(".showbtn").click(function () { $("#bg").css({  display: "block", height: $(document).height() }); var $box = $('.box'); $box.css({  //設(shè)置彈出層距離左邊的位置  left: ($("body").width() - $box.width()) / 2 - 20 + "px",  //設(shè)置彈出層距離上面的位置  top: ($(window).height() - $box.height()) / 2 + $(window).scrollTop() + "px",  display: "block" }); }); //點(diǎn)擊關(guān)閉按鈕的時(shí)候，遮罩層關(guān)閉 $(".close").click(function () { $("#bg,.box").css("display", "none"); });});