this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe 
this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe map操作符执行的逻辑就是：
source => pathOrMapFn(source … )
this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe this.counter$ = store.select(fromExample.getCounterCounter)之后马上subscribe 
