RxJs

rxjs

of

 Rof(): Observable<any>{
    return  of(1,2,3,4)
  }
  Tof(){
    this.Rof().subscribe(
      next => console.log('next:', next),
      err => console.log('error:', err),
      () => console.log('the end'),
    );
  }

/*
next: 1
next: 2
next: 3
the end
*/

from

  RFrom(): Observable<any>{
    return from([10, 20, 30], asyncScheduler)
  }
  TFrom(){
    this.RFrom().subscribe(
      next => console.log('next:', next),
      err => console.log('error:', err),
      () => console.log('the end'),
    );
  }

/*
next: 10
next: 20
next: 30
the end
*/

concat

 //顺序增加
  RConcat(): Observable<any>{
    return concat( this.RFrom(),this.Rof())
  }
  TConcat(){
    this.RConcat().subscribe(
      next => console.log('next:', next),
      err => console.log('error:', err),
      () => console.log('the end'),
    );
  }

/*
next: 10
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:51
next: 20
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:51
next: 30
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:51
next: 1
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:51
next: 2
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:51
next: 3
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:51
next: 4
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:51
the end

*/

merge

//倒序增加
  Rmerge(): Observable<any>{
    return merge(this.RFrom(),this.Rof())
  }
  Tmerge(){
    this.Rmerge().subscribe(
      next => console.log('next:', next),
      err => console.log('error:', err),
      () => console.log('the end'),
    );
  }

/*
next: 1
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:62
next: 2
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:62
next: 3
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:62
next: 4
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:62
next: 10
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:62
next: 20
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:62
next: 30
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:62
the end
*/

Subject

  fristSubject = new Subject<string>()
  //监听
   this.fristSubject.subscribe(x=>{
      console.log(x)
    })
  //发送
   this.fristSubject.next('id')

/*
id
*/

ReplaySubject

  repalysubject =new  ReplaySubject<string>();
this.repalysubject.next('1')
this.repalysubject.next('2')



 this.repalysubject.subscribe(x=>{
  console.log(x)
})

/*
1
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:51
2
*/

Observable

//有值就会发送
  fristObservable: Observable<any>
    this.fristSubject.subscribe(x=>{
      this.fristObservable = of(x,30,20)
      
      console.log("fristSubject"+x)

      this.fristObservable.subscribe((x)=>{
        console.log("fristObservable"+x)
      })
    })
    this.fristSubject.next('id')
/*
fristSubjectid
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:34
fristObservableid
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:37
fristObservable30
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:37
fristObservable20

*/

BehaviorSubject

  fristBehaviorSubject = new BehaviorSubject<string>('1');
  //监听
    this.fristBehaviorSubject.subscribe(x=>{
      console.log(x)
    })
  //发送
    this.fristBehaviorSubject.next('123123')

/*

src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:44
1

src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:44
123123

*/

Subscription

 this.fristWatcher =    this.fristBehaviorSubject.subscribe(x=>{
      console.log(x)
    })
    this.fristWatcher.unsubscribe()
    this.fristBehaviorSubject.next('123123')//接收不到

/*

src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:44
1

src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:44
123123

*/

rxjs/operators

skip

Rof(): Observable<any>{
    return  of(1,2,3,4)
  }
 this.Rof().pipe(skip(1)).subscribe(x=>{
      console.log(x)
    })

/*
2
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:77
3
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:77
4

*/

tap

//适用于单个流
   of(1).pipe(tap(x=>{
      x = x*10
      console.log(x)
    })).subscribe(x=>{
      console.log(x)
    })

/*
10
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:86
1

*/

map

//适用于多个流
this.Rof().pipe(map(x=>{
      
      let xx = x*10
      console.log(xx)
      return xx
    })).subscribe(
      x=>{
        console.log(x)
      }
    )
/*
10
10
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:96
20
20
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:96
30
30
src/app/pages/modules/dashboards/guild/detail-guild/detail-guild.component.ts:96
40
40

*/

takeUntil

class SomeComponent implements OnInit, OnDestroy {
    private destroy$ = new Subject();

    ngOnInit() {
        service.someStream().takeUntil(this.destroy$).subscribe(doSomething);
    }

    ngOnDestroy() {
        this.destroy$.next(true);
    }
}

*/

debounceTime，auditTime，debounceTime

3个分别的使用 :

用户 keydown 时我想监听

1. debounceTime 1000， 用户连续 keydown 我等 1 秒, 一秒中内用户又 keydown 了，我重新记时，再等 1 秒... 一直到用户 1 秒内再也没有 keydown 我才触发

2. auditTime 1000 用户连续 keydown, 我等 1 秒，一秒中内用户又 keydown 了, 但我 "不" 重新记时了, 1 秒后我就触发, 也就是说, 用户 1 秒内按多少次，我都当成 1 次 并且在 1 秒后才触发.

3. debounceTime 1000, 用户连续 keydown, 我直接触发, 一秒中内用户又 keydown 了, 我不理，直到 1 秒后

特色
debounceTime 重新计时, 一直不触发
auditTime 等..触发
debounceTime 触发...等

distinct，distinctUntilChanged

它就是我们熟悉的 distinct, 如果值相同就忽略 callback

distinct((x) => { return x.value }); 可以提供一个取值的方法，对比估计是用 ===

distinct 会把所有的值都存起来做对比, distinctUntilChanged 的区别是它只会存最后一次的值做对比.

concatMap, switchMap, mergeMap

就是 map() + switchAll(), map() + concatAll(), map() + mergeAll() 的缩写而已.

还有个好处是它可以传入一个方法 (a,b,c,d) => next, 可以获取到 o1,o2 的值然后返回下一个值.

参考链接：https://www.cnblogs.com/keatkeat/p/5900998.html ，https://ithelp.ithome.com.tw/articles/10188387