1、效果：
全宽分辨率
中宽分辨率
窄宽分辨率
<div class="container"> <div class="row"> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> <div class="col-md-1">col-md-1</div> </div> <div class="row"> <div class="col-md-8 col-sm-6">md8</div> <div class="col-md-4 col-sm-6">md4</div> </div> </div> http://v3.bootcss.com/css/#grid
