# Grid 栅格
通过基础的 24 分栏,迅速简便地创建布局
- 通过 - row在水平方向建立一组- col( column 的简写)
- 内容应当放置于 - col内,且只有- col可以作为- row的直接元素
- 栅格系统中的列是指 1 到 24 的值来表示其跨越的范围 
# 基础布局
使用单一分栏创建基础的栅格布局
通过 Row 和 Col 组件,并通过 Col 组件的 span 属性可以自由地组合布局
<ch-row>
  <ch-col span="24"><div class="grid-content bg-green-dark"></div></ch-col>
</ch-row>
<ch-row>
  <ch-col span="12"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="12"><div class="grid-content bg-green-light"></div></ch-col>
</ch-row>
<ch-row>
  <ch-col span="8"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="8"><div class="grid-content bg-green-light"></div></ch-col>
  <ch-col span="8"><div class="grid-content bg-green"></div></ch-col>
</ch-row>
<ch-row>
  <ch-col span="6"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="6"><div class="grid-content bg-green-light"></div></ch-col>
  <ch-col span="6"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="6"><div class="grid-content bg-green-light"></div></ch-col>
</ch-row>
<ch-row>
  <ch-col span="4"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="4"><div class="grid-content bg-green-light"></div></ch-col>
  <ch-col span="4"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="4"><div class="grid-content bg-green-light"></div></ch-col>
  <ch-col span="4"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="4"><div class="grid-content bg-green-light"></div></ch-col>
</ch-row>
<style lang="scss">
.ch-row { margin-bottom: 20px; &:last-child { margin-bottom: 0; } }
.bg-green { background: #b7eb8f; }
.bg-green-light { background: #d9f7be; }
.bg-green-dark { background: #95de64; }
.grid-content { border-radius: 2px; min-height: 36px; }
</style>
# 分栏间隔
各分栏之间可以存在间隔
Row 提供 gutter 属性来指定每一栏之间的间隔,默认间隔为 0。
<ch-row gutter="20">
  <ch-col span="8"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="8"><div class="grid-content bg-green-light"></div></ch-col>
  <ch-col span="8"><div class="grid-content bg-green"></div></ch-col>
</ch-row>
<ch-row gutter="20">
  <ch-col span="6"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="6"><div class="grid-content bg-green-light"></div></ch-col>
  <ch-col span="6"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="6"><div class="grid-content bg-green-light"></div></ch-col>
</ch-row>
# 分栏偏移
可以指定偏移的栏数
通过制定 Col 组件的 offset 属性可以指定分栏偏移的栏数。
<ch-row>
  <ch-col span="6" offset="6"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="6" offset="6"><div class="grid-content bg-green"></div></ch-col>
</ch-row>
<ch-row>
  <ch-col span="6"><div class="grid-content bg-green"></div></ch-col>
  <ch-col span="6" offset="6"><div class="grid-content bg-green"></div></ch-col>
</ch-row>
<ch-row>
  <ch-col span="12" offset="6"><div class="grid-content bg-green"></div></ch-col>
</ch-row>
# 响应式布局
预设了五个响应式尺寸:xs、sm、md、lg 和 xl
xs、sm、md、lg 和 xl 接收一个对象为参数,如:{span: 4, offset: 4}
<ch-row gutter="10">
  <ch-col :xs="{span:8}" :sm="{span:6}" :md="{span:4}" :lg="{span:3}" :xl="{span:2}">
     <div class="grid-content bg-green"></div>
  </ch-col>
  <ch-col :xs="{span:4}" :sm="{span:6}" :md="{span:8}" :lg="{span:9}" :xl="{span:10}">
     <div class="grid-content bg-green-light"></div>
</ch-col>
  <ch-col :xs="{span:4}" :sm="{span:6}" :md="{span:8}" :lg="{span:9}" :xl="{span:10}">
    <div class="grid-content bg-green"></div>
  </ch-col>
  <ch-col :xs="{span:8}" :sm="{span:6}" :md="{span:4}" :lg="{span:3}" :xl="{span:2}">
    <div class="grid-content bg-green-light"></div>
  </ch-col>
</ch-row>
<ch-row gutter="10">
  <ch-col :xs="{span:2}" :sm="{span:4}" :md="{span:6}" :lg="{span:8}" :xl="{span:10}">
    <div class="grid-content bg-green"></div>
  </ch-col>
  <ch-col :xs="{span:20}" :sm="{span:16}" :md="{span:12}" :lg="{span:8}" :xl="{span:4}">
    <div class="grid-content bg-green-light"></div>
  </ch-col>
  <ch-col :xs="{span:2}" :sm="{span:4}" :md="{span:6}" :lg="{span:8}" :xl="{span:10}">
    <div class="grid-content bg-green"></div>
  </ch-col>
</ch-row>
# Row 属性
| 属性 | 说明 | 类型 | 可选值 | 默认值 | 
|---|---|---|---|---|
| gutter | 栅格的间隔 | Number / String | —— | 0 | 
| align | 水平排列方式 | String | left / right / center | left | 
# Col 属性
| 属性 | 说明 | 类型 | 可选值 | 默认值 | 
|---|---|---|---|---|
| span | 栅格占的列数 | Number / String | —— | —— | 
| offset | 栅格往右偏移的格数 | Number / String | —— | 0 | 
| xs | <=575px 栅格属性对象 | Object (例如: {span: 4, offset: 4}) | —— | —— | 
| sm | >=576px 栅格属性对象 | Object (例如: {span: 4, offset: 4}) | —— | —— | 
| md | >=768px 栅格属性对象 | Object (例如: {span: 4, offset: 4}) | —— | —— | 
| lg | >=992px 栅格属性对象 | Object (例如: {span: 4, offset: 4}) | —— | —— | 
| xl | >=1200px 栅格属性对象 | Object (例如: {span: 4, offset: 4}) | —— | —— | 
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