feat: migrate Sidebar component
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# Sidebar 侧边导航
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### 引入
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```js
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import Vue from 'vue';
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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`v-model`绑定当前选中项的索引
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```html
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<van-sidebar v-model="activeKey">
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<van-sidebar-item title="标签名称" />
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<van-sidebar-item title="标签名称" />
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<van-sidebar-item title="标签名称" />
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</van-sidebar>
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```
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```js
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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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};
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```
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### 徽标提示
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设置`dot`属性后,会在右上角展示一个小红点。设置`badge`属性后,会在右上角展示相应的徽标
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```html
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<van-sidebar v-model="activeKey">
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<van-sidebar-item title="标签名称" dot />
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<van-sidebar-item title="标签名称" badge="5" />
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<van-sidebar-item title="标签名称" badge="99+" />
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</van-sidebar>
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```
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### 禁用选项
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通过`disabled`属性禁用选项
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```html
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<van-sidebar v-model="activeKey">
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<van-sidebar-item title="标签名称" />
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<van-sidebar-item title="标签名称" disabled />
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<van-sidebar-item title="标签名称" />
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</van-sidebar>
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```
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### 监听切换事件
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设置`change`方法来监听切换导航项时的事件
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```html
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<van-sidebar v-model="activeKey" @change="onChange">
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<van-sidebar-item title="标签名1" />
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<van-sidebar-item title="标签名2" />
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<van-sidebar-item title="标签名3" />
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</van-sidebar>
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```
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```js
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import { Notify } from 'vant';
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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(index) {
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Notify({ type: 'primary', message: index });
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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 |
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| ---------------- | ---------------- | ------------------ | ------ |
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| v-model `v2.0.4` | 当前导航项的索引 | _number \| string_ | `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 | 切换导航项时触发 | index: 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 |
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| --- | --- | --- | --- |
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| title | 内容 | _string_ | `''` |
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| dot `v2.2.1` | 是否显示右上角小红点 | _boolean_ | `false` |
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| badge `v2.5.6` | 图标右上角徽标的内容 | _number \| string_ | - |
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| info | 图标右上角徽标的内容(已废弃,请使用 badge 属性) | _number \| string_ | - |
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| disabled `v2.2.0` | 是否禁用该项 | _boolean_ | `false` |
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| url | 点击后跳转的链接地址 | _string_ | - |
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| to `v2.0.4` | 点击后跳转的目标路由对象,同 vue-router 的 [to 属性](https://router.vuejs.org/zh/api/#to) | _string \| object_ | - |
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| replace `v2.0.4` | 是否在跳转时替换当前页面历史 | _boolean_ | `false` |
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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 | index: 当前导航项的索引 |
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