三.类前缀与视口关系图
xs sm md lg xl xxl
>=0 >=576 >=768 >=992 >=1200 >=1400
类前缀 col col-sm col-md col-lg col-xl col-xxl
四.Grid实例
<div class="container">
<div class="row">
<div class="col-sm">
One of three columns
</div>
<div class="col-sm">
One of three columns
</div>
<div class="col-sm">
One of three columns
</div>
</div>
</div>
五.等宽
<div class="row">
<div class="col">
1 of 2
</div>
<div class="col">
2 of 2
</div>
</div>
六.设置一列宽度
<div class="row">
<div class="col">
1 of 3
</div>
<div class="col-6">
2 of 3 (wider)
</div>
<div class="col">
3 of 3
</div>
</div>