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docs(Tab): add use with popup doc (#3165)

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fix #3155
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rex 2020-05-22 10:13:28 +08:00 committed by GitHub
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packages/tab/README.md
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@ -164,6 +164,23 @@ Page({
</van-tabs>
```
### 嵌套 popup
如果将 van-tabs 嵌套在 van-popup 等会隐藏内容的组件或节点内，当 van-tabs 显示时下划线将不会正常显示。
此时可以通过使用 `wx:if` 手动控制 van-tabs 的渲染来规避这种场景。
```html
<van-popup show="{{ show }}">
<van-tabs wx:if="{{ show }}">
<van-tab title="标签 1">内容 1</van-tab>
<van-tab title="标签 2">内容 2</van-tab>
<van-tab title="标签 3">内容 3</van-tab>
<van-tab title="标签 4">内容 4</van-tab>
</van-tabs>
</van-popup>
```
## API
### Tabs Props