13.5.18 - withLatestFrom

主数据源发出的数据流总是和支数据源中的最新数据流进行结合，返回数组

import { fromEvent, interval } from "rxjs"
import { withLatestFrom } from "rxjs/operators"
const clicks = fromEvent(document, "click")
const timer = interval(1000)
clicks.pipe(withLatestFrom(timer)).subscribe(console.log)