#### 响应式布局
参照 Bootstrap 的 [响应式设计](http://getbootstrap.com/css/#grid-media-queries),预设六个响应尺寸:`xs` `sm` `md` `lg` `xl` `xxl`。
#### 响应式布局
Referring to the Bootstrap [responsive design] (http://getbootstrap.com/css/#grid-media-queries), here preset six dimensions: `xs` `sm` `md` `lg` `xl`.
```tpl
Col
Col
Col
```