this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe 
this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe map操作符執行的邏輯就是：
source => pathOrMapFn(source … )
this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之後馬上subscribe 
