CSS遮罩，居中

 

JQuery使Div居中

 (function ($) {//面板出现位置
        $.fn.extend({
            center: function () {
                return this.each(function () {
                    var top = ($(window).height() - $(this).outerHeight()) / 4;
                    var left = ($(window).width() - $(this).outerWidth()) / 2;
                    $(this).css({ position: 'absolute', margin: 0, top: (top > 0 ? top : 0) + 'px', left: (left > 0 ? left : 0) + 'px' });
                });
            }
        });
 })(jQuery);

 

CSS+JQuery遮罩

主要是以下三个样式：

position:absolute; z-index:100;background-color:#fff;

 

<style type="text/css">
body{margin:0px;}
#BgDiv{background-color:#e3e3e3; position:absolute; z-index:99; left:0; top:0; display:none; width:100%; height:1000px;opacity:0.5;filter: alpha(opacity=50);-moz-opacity: 0.5;}

#DialogDiv{position:absolute;width:400px; left:50%; top:50%; margin-left:-200px; height:auto; z-index:100;background-color:#fff; border:1px #8FA4F5 solid; padding:1px;}
#DialogDiv h2{ height:25px; font-size:14px; background-color:#8FA4F5; position:relative; padding-left:10px; line-height:25px;}
#DialogDiv h2 a{position:absolute; right:5px; font-size:12px; color:#000000}
#DialogDiv .form{padding:10px;}
</style>
<script language="javascript" type="text/javascript">
function ShowDIV(thisObjID) {
$("#BgDiv").css({ display: "block", height: $(document).height() });
var yscroll = document.documentElement.scrollTop;
$("#" + thisObjID).css("top", "100px");
$("#" + thisObjID).css("display", "block");
document.documentElement.scrollTop = 0;
}

function closeDiv(thisObjID) {
$("#BgDiv").css("display", "none");
$("#" + thisObjID).css("display", "none");
}
</script>


<div id="BgDiv"></div>

<!--遮罩层显示的DIV1-->
<div id="DialogDiv" style="display:none">
<h2>弹出层<a href="javascript:;" id="btnClose" onclick="closeDiv('DialogDiv')">关闭</a></h2>
<div class="form">我是弹出对话框111111！！</div>
</div>