技术要点：

一个覆盖整个屏幕的浅灰色背景的div,一个包含内容的的div,

代码如下：

<div id="financeTip" style=""><div class="financeTipBg" style=""></div><div id="financeTipInfor" class="e-tankuang alert financeTankuang" style=" "><button type="button" class="close tanweizhiClose" data-dismiss="alert">&times;</button><div class="e-tankuang-title" id="myModalLabel">弹出框标题</div><div class="e-tankuang-content">弹出框信息</div></div></div>

$(document).ready(function(){var m1_top = ( $(window).height() - $("#financeTipInfor").height() )/2;var m1_left = ( $(window).width() - $("#financeTipInfor").width() )/2;$("#financeTipInfor").css({"margin": m1_top + "px" +" "+ m1_left + "px"});window.onresize=function(){var m1_top = ( $(window).height() - $("#financeTipInfor").height() )/2;var m1_left = ( $(window).width() - $("#financeTipInfor").width() )/2;// $("#financeTipInfor").css({"margin": m1_top + "px auto","left": m1_left + "px"});$("#financeTipInfor").css({"margin": m1_top + "px" +" "+ m1_left + "px"});}$(".close").click(function () {$("#financeTip").css({"display": "none"});});
});

#financeTip{width:100%;overflow:hidden;}.financeTankuang{width:90%;}@media (min-width: 768px){.financeTankuang{width:600px;}}.financeTipBg{position:absolute;width:100%;height:100%;background:#000;z-index:8001;left:0;top:0;opacity:0.2}#financeTipInfor{position:absolute;left:0;top:0;z-index:8011;}