pull-down-refresh.md

## uni.startPullDownRefresh(options?) @startpulldownrefresh

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## uni.stopPullDownRefresh() @stoppulldownrefresh

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使用：
1. 首先pages.json里配置了页面可下拉刷新`"enablePullDownRefresh": true`
2. 当用户下拉页面时触发页面生命周期`onPullDownRefresh`
3. 在合适的时机（如联网刷新数据结束），调用本API`uni.stopPullDownRefresh()`，结束下拉刷新状态

本API仅负责页面下拉刷新。如使用组件下拉刷新，另见scroll-view、list-view等组件的文档。

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