class="row"
,行的里面写列(即格子系统)class="gird"
<div class="row">
<div class="gird eight "> ... </div>
<div class="gird four "> ... </div>
</div>
class="row"
<div class="row">
<div class="gird eight ">
<div class="row">
<div class="gird four">
...
</div>
<div class="gird four">
...
</div>
</div>
</div>
<div class="gird four ">
...
</div>
</div>d