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                很多操作符可用于對Observable發射的`onError`通知做出響應或者從錯誤中恢復,例如,你可以: 1. 吞掉這個錯誤,切換到一個備用的Observable繼續發射數據 2. 吞掉這個錯誤然后發射默認值 3. 吞掉這個錯誤并立即嘗試重啟這個Observable 4. 吞掉這個錯誤,在一些回退間隔后重啟這個Observable 這是操作符列表: * [**`onErrorResumeNext(?)`**](Catch.md#onErrorResumeNext) — 指示Observable在遇到錯誤時發射一個數據序列 * [**`onErrorReturn(?)`**](Catch.md#onErrorReturn) — 指示Observable在遇到錯誤時發射一個特定的數據 * [**`onExceptionResumeNext(?)`**](Catch.md#onExceptionResumeNext) — instructs an Observable to continue emitting items after it encounters an exception (but not another variety of throwable)指示Observable遇到錯誤時繼續發射數據 * [**`retry(?)`**](Retry.md#retry) — 指示Observable遇到錯誤時重試 * [**`retryWhen(?)`**](Retry.md#retryWhen) — 指示Observable遇到錯誤時,將錯誤傳遞給另一個Observable來決定是否要重新給訂閱這個Observable
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