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                ## Publish 將普通的Observable轉換為可連接的Observable ![publish](https://box.kancloud.cn/06cbcc60d2c07d69d774d2b522ad6121_1280x1020.png) 可連接的Observable (*connectable Observable*)與普通的Observable差不多,不過它并不會在被訂閱時開始發射數據,而是直到使用了`Connect`操作符時才會開始。用這種方法,你可以在任何時候讓一個Observable開始發射數據。 ![publish](https://box.kancloud.cn/2019abe819b58c673256f8d3a97b1a7d_1280x1020.png) RxJava的實現為`publish`。 * Javadoc: [publish()](http://reactivex.io/RxJava/javadoc/rx/Observable.html#publish()) ![publish](https://box.kancloud.cn/e99bef8274d7284c0670af1314b7ef89_1280x1020.png) 有一個變體接受一個函數作為參數。這個函數用原始Observable發射的數據作為參數,產生一個新的數據作為`ConnectableObservable`給發射,替換原位置的數據項。實質是在簽名的基礎上添加一個`Map`操作。 * Javadoc: [publish(Func1)](http://reactivex.io/RxJava/javadoc/rx/Observable.html#publish(rx.functions.Func1))
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