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Apollo useSubscription React hook
将实时数据带入您的用户界面的最容易的方式，是使用 Apollo React-Hook 的 useSubscription React hook。这让您可以在组件的呈现函数中直接呈现来自服务的数据流！需要注意的是，订阅只是监听器，它们在第一次连接时不会请求任何数据，只会打开连接以获得新的数据。
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