RxJS中是否有一个操作符允许我缓冲项目并在信号可观察到的时候逐个发出它们？类似于bufferWhen，但是不是在每个信号上转储整个缓冲区，而是每个信号转储一定数量的缓冲区。它甚至可以转储信号可观察到的数字。
<built-in method WaitForSingleObject> 1 65706 65706
<built-in method OpenKey> 6928 125 125
<built-in method stat> 2547 89 89
<built-in method loads> 458 40 40
<built-in method __build_class__> 1397 280 26
get_data 458 37 24
<built-in method CreateProcess> 1 22 22
<built-in method QueryValueEx> 1090 16 16
read_windows_registry 1 157 16
<built-in method EnumKey> 5908 14 14
<method 'read' of '_io.FileIO' objects> 458 12 12
__next 11248 13 12
_parse 528 35 11
<built-in method hasattr> 37294 30 9
答案 0 :(得分：6)
是的，您可以使用zip做您想做的事情：
const input = Rx.Observable.from(["a", "b", "c", "d", "e"]);
const signal = new Rx.Subject();
const output = Rx.Observable.zip(input, signal, (i, s) => i);
output.subscribe(value => console.log(value));
signal.next(1);
signal.next(1);
signal.next(1);.as-console-wrapper { max-height: 100% !important; top: 0; }<script src="https://unpkg.com/rxjs@5/bundles/Rx.min.js"></script>
事实上，zip用作this GitHub issue中与缓冲相关的示例。
如果您想使用信号的发射值来确定要释放多少个缓冲值，您可以这样做：
const input = Rx.Observable.from(["a", "b", "c", "d", "e"]);
const signal = new Rx.Subject();
const output = Rx.Observable.zip(
input,
signal.concatMap(count => Rx.Observable.range(0, count)),
(i, s) => i
);
output.subscribe(value => console.log(value));
signal.next(1);
signal.next(2);
signal.next(1);.as-console-wrapper { max-height: 100% !important; top: 0; }<script src="https://unpkg.com/rxjs@5/bundles/Rx.min.js"></script>
答案 1 :(得分：1)
window可用于分隔时间轴。 takeLast用于保存输出。
let signal = Rx.Observable.interval(1000).take(4);
let input = Rx.Observable.interval(300).take(10).share();
let output = input
.do(value => console.log(`input = ${value}`))
.window(signal)
.do(() => console.log(`*** signal : end OLD and start NEW subObservable`))
.mergeMap(subObservable => {
return subObservable.takeLast(100);
})
.share()
output.subscribe(value => console.log(` output = ${value}`));
Rx.Observable.merge(input.mapTo(1), output.mapTo(-1))
.scan((count, diff) => {
return count + diff;
}, 0)
.subscribe(count => console.log(` count = ${count}`));.as-console-wrapper { max-height: 100% !important; top: 0; }<script src="https://unpkg.com/rxjs/bundles/Rx.min.js"></script>
<强>结果：
22:28:37.971 *** signal : end OLD and start NEW subObservable
22:28:38.289 input = 0
22:28:38.292 count = 1
22:28:38.575 input = 1
22:28:38.576 count = 2
22:28:38.914 input = 2
22:28:38.915 count = 3
<signal received>
22:28:38.977 output = 0
22:28:38.979 count = 2
22:28:38.980 output = 1
22:28:38.982 count = 1
22:28:38.984 output = 2
22:28:38.986 count = 0
22:28:38.988 *** signal : end OLD and start NEW subObservable
22:28:39.175 input = 3
22:28:39.176 count = 1
22:28:39.475 input = 4
22:28:39.478 count = 2
22:28:39.779 input = 5
22:28:39.780 count = 3
<signal received>
22:28:39.984 output = 3
22:28:39.985 count = 2
22:28:39.986 output = 4
22:28:39.988 count = 1
22:28:39.989 output = 5
22:28:39.990 count = 0
22:28:39.992 *** signal : end OLD and start NEW subObservable
22:28:40.075 input = 6
22:28:40.077 count = 1
22:28:40.377 input = 7
22:28:40.378 count = 2
22:28:40.678 input = 8
22:28:40.680 count = 3
22:28:40.987 input = 9
22:28:40.990 count = 4
<input completed>
22:28:40.992 output = 6
22:28:40.993 count = 3
22:28:40.995 output = 7
22:28:40.996 count = 2
22:28:40.998 output = 8
22:28:40.999 count = 1
22:28:41.006 output = 9
22:28:41.007 count = 0