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样式操作

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>    <title></title>    <style type ="text/css">        #areaPlay {        border :1px solid #000;        width :500px;        height :400px;        margin :50px  auto ;        z-index:9999999;/**越大越上面 只对绝对布局有效*/        position :absolute;/**绝对定位*/        background-color:#fff;         left :200px;         top:200px;        }        #showdow {         border :1px solid #000;         width :100%;         height:700px;         position :absolute;/**绝对定位*/         left :2px;         top:2px;         background-color:#808080;         opacity:0.4;/**透明度*/          z-index:9999998;/**越大越上面 只对绝对布局有效*/        }        .show {         display:block;        }        .hid {         display:none;        }    </style>    <script src="http://www.mamicode.com/Scripts/jquery-1.8.2.min.js"></script>    <script type ="text/javascript">        $(function () {            $("#showdow").addClass("hid");        });        function trunOff()        {            // $("#showdow").addClass("show");           // $("#showdow").attr("class","show");            $("#showdow").toggleClass("hid");//内部判断hid样式是否存在如果有就移除,如果没有就加进去        }        function trunOff() {            $("#showdow").toggleClass("hid");//切换样式        }    </script></head><body>     <a href="javascript:trunOff()" >关灯</a>       <div id="areaPlay">播放区域         <a href="javascript:trunOff()">开灯</a>    </div>    <input type ="text" />    <div id="showdow" class="hid"></div></body></html>