RxJS 根据发出的值重复

我在尝试着repeat根据返回的值进行承诺调用condition场地。以下块不起作用，因为v未定义且随机抛出TypeError: Cannot read property 'condition' of undefined

console.log 的 o/p 是{ Items: [ 1, 2, 3, 4, 5 ], condition: 5, time: 1513827310333 }

JSFiddle https://jsfiddle.net/nilobarp/3sx2gh2c/

const source = Rx.Observable.fromPromise(
  Promise.resolve({
    Items: [1, 2, 3, 4, 5],
    condition: Math.floor(Math.random() * 10),
    time: +new Date()
  })
);

source
  .map(val => val)
  .repeatWhen(val => {
    return val.map(v => { // v is undefined
      if (v.condition > 0) {
        return Rx.Observable.of(v);
      } else {
        return Rx.Observable.empty();
      }
    });
  })
  .finally(() => {
    done();
  })
  .subscribe(val => console.log(val));

让它与外部标志一起工作，并为每次重复评估源。

const source = Rx.Observable.defer(() =>
  Promise.resolve({
    Items: [1, 2, 3, 4, 5],
    condition: Math.floor(Math.random() * 10),
    time: +new Date()
  })
);

let condition = false;

source
  .repeatWhen(notifications => {
    return notifications
      .scan(() => {
        return condition;
      }, false)
      .delay(100)
      .takeWhile(() => {
        return condition;
      });
  })
  .do(x => (condition = x.condition !== 0))
  .finally(console.log("done"))
  .subscribe(console.log);

.as-console-wrapper { max-height: 100% !important; top: 0; }

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