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docs(IndexBar): add Q&A (#4459)

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* docs(IndexBar): add Q&A

* docs(IndexBar): update doc
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nemo-shen 2021-09-07 10:05:43 +08:00 committed by GitHub
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packages/index-bar/README.md
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@ -105,3 +105,12 @@ Page({
| 名称 | 说明 |
| ---- | -------------------------------- |
| - | 锚点位置显示内容，默认为索引字符 |
## 常见问题
### 嵌套在滚动元素中 IndexAnchor 失效？
由于 `<IndexBar />` 内部使用 wx.pageScrollTo 滚动到指定位置，因此只支持页面级滚动，无法在滚动元素中嵌套使用，例如：`view` 使用 `overflow: scroll;` 或者 `scroll-view`，
具体可查看[微信小程序文档](https://developers.weixin.qq.com/miniprogram/dev/api/ui/scroll/wx.pageScrollTo.html)。
历史issue: [#4252](https://github.com/youzan/vant-weapp/issues/4252)