vant-weapp/packages/col/README.md
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# Layout 布局
### 介绍
Layout 提供了`van-row``van-col`两个组件来进行行列布局。
### 引入
`app.json``index.json`中引入组件,详细介绍见[快速上手](#/quickstart#yin-ru-zu-jian)。
```json
"usingComponents": {
"van-row": "@vant/weapp/row/index",
"van-col": "@vant/weapp/col/index"
}
```
## 代码演示
### 基本用法
Layout 组件提供了`24列栅格`,通过在`Col`上添加`span`属性设置列所占的宽度百分比。此外,添加`offset`属性可以设置列的偏移宽度,计算方式与 span 相同。
```html
<van-row>
<van-col span="8">span: 8</van-col>
<van-col span="8">span: 8</van-col>
<van-col span="8">span: 8</van-col>
</van-row>
<van-row>
<van-col span="4">span: 4</van-col>
<van-col span="10" offset="4">offset: 4, span: 10</van-col>
</van-row>
<van-row>
<van-col offset="12" span="12">offset: 12, span: 12</van-col>
</van-row>
```
### 设置列元素间距
通过`gutter`属性可以设置列元素之间的间距,默认间距为 0。
```html
<van-row gutter="20">
<van-col span="8">span: 8</van-col>
<van-col span="8">span: 8</van-col>
<van-col span="8">span: 8</van-col>
</van-row>
```
## API
### Row Props
| 参数 | 说明 | 类型 | 默认值 |
| ------ | ----------------------------- | ------------------ | ------ |
| gutter | 列元素之间的间距(单位为 px | _string \| number_ | - |
### Col Props
| 参数 | 说明 | 类型 | 默认值 |
| ------ | -------------- | ------------------ | ------ |
| span | 列元素宽度 | _string \| number_ | - |
| offset | 列元素偏移距离 | _string \| number_ | - |
### 外部样式类
| 类名 | 说明 |
| ------------ | ------------ |
| custom-class | 根节点样式类 |