Question

retry

函数签名: retry(number: number): Observable

如果发生错误，以指定次数重试 observable 序列。

示例

示例 1: 出错的话可以重试2次

( StackBlitz | jsBin | jsFiddle )

// RxJS v6+
import { interval, of, throwError } from 'rxjs';
import { mergeMap, retry } from 'rxjs/operators';

// 每1秒发出值
const source = interval(1000);
const example = source.pipe(
  mergeMap(val => {
    // 抛出错误以进行演示
    if (val > 5) {
      return throwError('Error!');
    }
    return of(val);
  }),
  // 出错的话可以重试2次
  retry(2)
);
/*
  输出:
  0..1..2..3..4..5..
  0..1..2..3..4..5..
  0..1..2..3..4..5..
  "Error!: Retried 2 times then quit!"
*/
const subscribe = example.subscribe({
  next: val => console.log(val),
  error: val => console.log(`${val}: Retried 2 times then quit!`)
});

其他资源

• retry :newspaper: - 官方文档
• 错误处理操作符: retry 和 retryWhen :video_camera: :dollar: - André Staltz

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源码: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/retry.ts