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並前往https://book.flutterchina.club/chapter7/futurebuilder_and_streambuilder.html

7.6 异步UI更新（FutureBuilder、StreamBuilder） | 《Flutter实战

但由于在实际开发中依赖异步数据更新UI的这种场景非常常见，因此Flutter专门提供了 FutureBuilder 和 ... connectionState 获取异步任务的状态信息、通过 snapshot.

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