[Doc] rename component README file (#3662)
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# Sidebar 侧边导航
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### 引入
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``` javascript
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import { Sidebar, SidebarItem } from 'vant';
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Vue.use(Sidebar);
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Vue.use(SidebarItem);
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```
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## 代码演示
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### 基础用法
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通过在`van-sidebar`上设置`active-key`属性来控制选中项
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```html
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<van-sidebar :active-key="activeKey" @change="onChange">
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<van-sidebar-item title="标签名称" />
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<van-sidebar-item title="标签名称" info="8" />
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<van-sidebar-item title="标签名称" info="99" />
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<van-sidebar-item title="标签名称" info="99+" />
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</van-sidebar>
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```
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``` javascript
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export default {
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data() {
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return {
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activeKey: 0
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};
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},
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methods: {
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onChange(key) {
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this.activeKey = key;
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}
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}
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};
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```
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## API
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### Sidebar Props
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| 参数 | 说明 | 类型 | 默认值 | 版本 |
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|------|------|------|------|------|
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| active-key | 当前导航项的索引 | `String | Number` | `0` | - |
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### Sidebar Events
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| 事件名 | 说明 | 回调参数 |
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|------|------|------|
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| change | 切换当前导航项时触发 | key: 当前导航项的索引 |
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### SidebarItem 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 | 内容 | `String` | `''` | - |
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| info | 提示消息 | `String | Number` | `''` | - |
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| url | 跳转链接 | `String` | - | - |
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### SidebarItem Events
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| 事件名 | 说明 | 回调参数 |
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|------|------|------|
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| click | 点击时触发 | key: 当前导航项的索引 |
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