js控制div层的叠加简单方法

<style type="text/css">
.favorite_icon{float:left; padding: 0 0 0 30px;}
.favorite_label{float:left; width:950px;}
.favorite_label h2{  border-bottom: medium none;height: 60px;padding: 0.8em 0 0 0px;}
.favorite_title{height:60px;margin:0px auto 12px auto;}
.favorite_title a:link, .favorite_title a:visited {color: #333; background-color:#8bb65a;}
.favorite_title a:hover {color: #333;text-decoration: none; background-color:#6c9541;}
.add_favorite {border-radius: 0;color: #fff !important;font-family: "宋体","Helvetica Neue",Helvetica,Arial,sans-serif;
 font-size: 12px;line-height: 17px;padding: 5px 16px;float: right !important;border: medium none;
 height: 18px;background-image: none;cursor: pointer;display: inline-block;font-weight: 400;margin-bottom: 0;
 text-align: center;vertical-align: middle;white-space: nowrap;text-decoration: none;}
#favorite_count{color:#303030;font-size:12px;padding: 0 0 0 7px;}
.favorite_list{clear:both; padding: 0 10px 200px 10px;}
.list_type li{float:left;line-height: 17px;} 
.list_type a{text-decoration: none;font-size: 15px;}
.list_type a:link {color: #6c9541;}
.list_type a:visited{color: #333;}
.list_type a:hover {color: #6c9541;text-decoration: none;}
.list_line{clear:both;height:10px; margin-bottom:10px;border-bottom:1px groove #ccc;}
.nums{font-weight:bold;}
.t1{border-bottom:1px dotted #ccc;height: 40px;padding: 0.8em 0 0 30px;}
.list_content{clear:both;}
.list_content h3{float:left; width:763px;}
.list_content a{text-decoration:none; display:block;font-family: "宋体","Helvetica Neue",Helvetica,Arial,sans-serif;
        font-size: 15px;color: #333; float:left; }
.list_content a:link, .favorite_title a:visited {color:#333;text-decoration: none;}
.list_content a:hover {color: #bb1c20;text-decoration: none; }
.date{color:#ccc;font-size:13px;padding: 0 0 0 7px;float:left !important;text-align: center; 
     vertical-align: middle;white-space: nowrap;text-decoration: none; }
.edit{ margin: 0 0 0 20px;}
.delete{ margin: 0 0 0 10px;}

.black_overlay{display:none;position:absolute;top:0%;left:0%;width:100%;height:100%;
  background-color:black;z-index:1001;-moz-opacity:0.8;opacity:.10;filter:alpha(opacity=80);}
.white_content{display:none;position:absolute;top:15%;left:25%;width:500px;height:250px;padding:16px;
  border:1px solid #ccc;background-color:white;z-index:1002;overflow:auto;}
.white_content a{float:right; color:#aca7a7;text-decoration: none;}
.form-group{clear:both; margin:10px 0 10px 0;}
.control-label{float:left; margin:10px 0 10px 30px;color:#aca7a7;}
#url,#title{width:330px;height:23px;border:solid 1px #ccc; background:#f8f8f8;color:#8d8585;}
.col-xs-9{float:left; margin:10px 0 10px 10px;}
.btn-default,.btn-primary{float:right; width:80px;border-radius: 0;color: #fff !important;
    font-family: "宋体","Helvetica Neue",Helvetica,Arial,sans-serif;font-size: 12px;line-height: 14px;
    padding: 5px 18px;text-align: center;vertical-align: middle;white-space: nowrap;text-decoration: none;}
.btn-default{border:solid 1px #ccc; background:#9a9a9a;color:#fff;margin:15px 20px 0 0;}
.btn-default:hover {background:#8d8585;}
.btn-primary{border:solid 1px #ccc; background:#8bb65a;color:#fff;margin:15px 78px 0 0;}
.btn-primary:hover {background:#6c9541;}
</style>

<div class="favorite_title">
    <div class="favorite_label">
      <img class="favorite_icon" width="48" height="48" src="/UploadFiles/2021-04-02/favorite_icon_48_48.jpg">

【效果预览】


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