[Doc] rename component README file (#3662)
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# Cell 单元格
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### 引入
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``` javascript
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import { Cell, CellGroup } from 'vant';
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Vue.use(Cell).use(CellGroup);
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```
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## 代码演示
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### 基础用法
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`Cell`可以单独使用,也可以与`CellGroup`搭配使用。`CellGroup`可以为`Cell`提供上下外边框。
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```html
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<van-cell-group>
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<van-cell title="单元格" value="内容" />
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<van-cell title="单元格" value="内容" label="描述信息" />
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</van-cell-group>
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```
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### 单元格大小
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通过`size`属性可以控制单元格的大小
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```html
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<van-cell title="单元格" value="内容" size="large" />
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<van-cell title="单元格" value="内容" size="large" label="描述信息" />
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```
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### 展示图标
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通过`icon`属性在标题左侧展示图标
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```html
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<van-cell title="单元格" icon="location-o" />
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```
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### 只设置 value
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只设置`value`时会向左对齐
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```html
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<van-cell value="内容" />
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```
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### 展示箭头
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传入`is-link`属性则会在右侧显示箭头,并且可以通过传入`arrow-direction`属性控制箭头方向
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```html
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<van-cell title="单元格" is-link />
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<van-cell title="单元格" is-link value="内容" />
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<van-cell title="单元格" is-link arrow-direction="down" value="内容" />
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```
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### 页面跳转
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可以通过`url`属性进行页面跳转,或通过`to`属性进行 vue-router 跳转
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```html
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<van-cell title="单元格" is-link url="//youzan.github.io/vant/mobile.html" />
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<van-cell title="单元格" is-link to="index" />
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```
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### 分组标题
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通过`CellGroup`的`title`属性可以指定分组标题
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```html
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<van-cell-group title="分组1">
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<van-cell title="单元格" value="内容" />
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</van-cell-group>
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<van-cell-group title="分组2">
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<van-cell title="单元格" value="内容" />
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</van-cell-group>
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```
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### 高级用法
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如以上用法不能满足你的需求,可以使用对应的`slot`来自定义显示的内容
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```html
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<van-cell value="内容" is-link>
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<template slot="title">
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<span class="custom-title">单元格</span>
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<van-tag type="danger">标签</van-tag>
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</template>
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</van-cell>
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<van-cell title="单元格" icon="shop-o">
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<van-icon
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slot="right-icon"
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name="search"
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style="line-height: inherit;"
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/>
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</van-cell>
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```
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## API
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### CellGroup Props
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| 参数 | 说明 | 类型 | 默认值 | 版本 |
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|------|------|------|------|------|
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| title | 分组标题 | `String` | `-` | 1.6.9 |
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| border | 是否显示外边框 | `Boolean` | `true` | - |
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### Cell Props
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| 参数 | 说明 | 类型 | 默认值 | 版本 |
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|------|------|------|------|------|
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| icon | 左侧图标名称或图片链接,可选值见 Icon 组件 | `String` | - | - |
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| title | 左侧标题 | `String | Number` | - | - |
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| value | 右侧内容 | `String | Number` | - | - |
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| label | 标题下方的描述信息 | `String` | - | - |
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| size | 单元格大小,可选值为 `large` | `String` | - | 1.4.4 |
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| url | 跳转链接 | `String` | - | - |
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| to | 路由跳转对象,同 `vue-router` 的 to | `String | Object` | - | - |
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| border | 是否显示内边框 | `Boolean` | `true` | - |
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| replace | 跳转时是否替换当前页面历史 | `Boolean` | `false` | - |
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| clickable | 是否开启点击反馈 | `Boolean` | `false` | - |
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| is-link | 是否展示右侧箭头并开启点击反馈 | `Boolean` | `false` | - |
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| required | 是否显示表单必填星号 | `Boolean` | `false` | - |
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| center | 是否使内容垂直居中 | `Boolean` | `false` | 1.0.3 |
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| arrow-direction | 箭头方向,可选值为 `left` `up` `down` | `String` | - | 1.1.10 |
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| title-style | 左侧标题额外样式 | `any` | - | 1.6.17 |
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| title-class | 左侧标题额外类名 | `any` | - | 1.4.8 |
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| value-class | 右侧内容额外类名 | `any` | - | 1.4.8 |
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| label-class | 描述信息额外类名 | `any` | - | 1.4.8 |
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### Cell Events
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| 事件名 | 说明 | 回调参数 |
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|------|------|------|
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| click | 点击单元格时触发 | - |
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### Cell Slots
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| 名称 | 说明 |
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|------|------|
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| default | 自定义`value`显示内容 |
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| title | 自定义标题显示内容 |
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| label | 自定义标题下方描述显示内容 |
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| icon | 自定义左侧图标 |
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| right-icon | 自定义右侧按钮,默认为`arrow` |
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