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？