更新时间:2022-12-09 23:39:16
尝试
.row div[class^="col"]:first-child {边框:3px纯黑色;}
示例
.row div[class^="col"]:first-child {边框:3px纯黑色;}
<div class="col-lg-3 col-md-3 col-sm-6 col-xs-12">一
<div class="col-lg-3 col-md-3 col-sm-6 col-xs-12">二
<div class="row"><div class="col-lg-3 col-md-3 col-sm-6 col-xs-12">三