goroutine传递指针问题

``` var wg sync.WaitGroup func changePoint(count *int) { defer wg.Done() nowVal := 7 count = &nowVal } func ExampleGoroutine(orgId string) { initVal := 5 count := &initVal wg.Add(1) go changePoint(count) wg.Wait() fmt.Println(*count) } ``` 为什么指针指向没有发生改变呢？