windowWhen
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2023-12-01
windowWhen
函数签名: windowWhen(closingSelector: function(): Observable): Observable
在提供的时间帧处关闭窗口,并发出从源 observable 中收集的值的 observable 。
示例
示例 1: 根据定时器开启和关闭窗口
( StackBlitz | jsBin | jsFiddle )
// RxJS v6+
import { interval, timer } from 'rxjs';
import { windowWhen, tap, mergeAll } from 'rxjs/operators';
// 立即发出值,然后每秒发出值
const source = timer(0, 1000);
const example = source.pipe(
// 每5秒关闭窗口并发出从源 observable 中收集的值的 observable
windowWhen(() => interval(5000)),
tap(_ => console.log('NEW WINDOW!'))
);
const subscribeTwo = example
.pipe(
// 窗口发出嵌套的 observable
mergeAll()
/*
输出:
"NEW WINDOW!"
0
1
2
3
4
"NEW WINDOW!"
5
6
7
8
9
*/
)
.subscribe(val => console.log(val));
其他资源
- windowWhen :newspaper: - 官方文档
源码: https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/windowWhen.ts