点击弹窗

一个点击弹出窗的小例子

html：

<div id="main"><a href="javascript:showBg();">点击这里查看效果</a>
    <div id="fullbg"></div>
    <div id="dialog">
        <p class="close"><a href="#" onclick="closeBg();">关闭</a></p>
        <div>正在加载，请稍后....</div>
    </div>
</div>

css：

 body {
            font-family:Arial, Helvetica, sans-serif;
            font-size:12px;
            margin:0;
        }
        #main {
            height:1800px;
            padding-top:90px;
            text-align:center;
        }
        #fullbg {
            background-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 {
            background-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; /* 浮动对话框 */
            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;
            background:#CCCCCC;
        }
        #dialog p.close {
            text-align:right;
            padding-right:10px;
        }
        #dialog p.close a {
            color:#fff;
            text-decoration:none;
        }

js:

  //显示灰色 jQuery 遮罩层
    function showBg() {
        var bh = $("body").height();
        var bw = $("body").width();
        $("#fullbg").css({
            height:bh,
            width:bw,
            display:"block"
        });
        $("#dialog").show();
    }
    //关闭灰色 jQuery 遮罩
    function closeBg() {
        $("#fullbg,#dialog").hide();
    }