用jquery实现浮动层div的浏览器居中

1.在页面的head中引入jquery

 <script type="text/javascript" src="<%=path%>/js/jquery-1.2.6.js"></script>

 

2.在页面的head中加入浮动层和遮罩层的样式

<style>

#previewDiv{z-index: 9999;position:absolute;display:none;background:#fff;border-top:5px solid #999;border-bottom:7px solid #999;border-left:5px solid #999;border-right:7px solid #999;}.mask {color:#C7EDCC;background-color:#999;position:absolute;top:0px;left:0px;width:100%;height:3000px;opacity: 0.6;filter: "alpha(opacity=60)";filter: alpha(Opacity=60);}

</style>

 

3.在页面的底部加上浮动的div

<div id="previewDiv"> <table id ="head"> <tr><td>短消息预览</td></tr> </table> <table align="center"> <tr><td> <div class="zhnx_neirong"> <h3>您收到了来自花花的回复</h3> <p class="duanluo">    内容：这是浮动层居中的实例</span></p> </div> <div class="zhnx_huifu"><p><a href="javascript:open('${mailboxBO.mailfrom}');">查看花花的名片</a></p></div> </td></tr> </table> <table align="center"> <tr><td><div><input type="button" value=" 关 闭 " οnclick="hide();"/></div></td></tr> </table> </div>

 

4.添加显示和隐藏的js函数

     function show(){        //添加并显示遮罩层           $("<div id='mask'></div>").addClass("mask").click(function() {}) .appendTo("body").fadeIn(0);             document.getElementById("mask").style.display = "block";             var windowWidth = document.documentElement.clientWidth;           var windowHeight = document.documentElement.clientHeight;           var popupHeight = $("#previewDiv").height();           var popupWidth = $("#previewDiv").width();            $("#previewDiv").css({               "position": "absolute",               "top": (windowHeight-popupHeight)/2+$(document).scrollTop(),               "left": (windowWidth-popupWidth)/2        });        $("#previewDiv").show();    }

 

    function hide(){        $("#mask").remove();        $("#previewDiv").hide();    }