浅谈go 协程的使用陷阱

func main() {
  for i := 0; i < 100; i++ {
    go func() {
      fmt.Println(i)
    }()
  }
}

func main() {
  for i := 0; i < 100; i++ {
    go func(i int) {
      fmt.Println(i)
    }(i)
  }
}

type Per struct {
  name string
  bh  int
}
func main() {
  p := &Per{}
  for i := 0; i < 100; i++ {
    p.bh = i
    go func(p *Per) {
      fmt.Println(p)
    }(p)
  }
}

map1 := make(map[int]int)
for i:=0; i<3; i++{
 map1[i] = i+1
}

fmt.Println(map1)
for k, v := range map1{
 go func(key, value int){
 fmt.Println("one way :", key, " : ", value)
 }(k, v)

 go func(){
 time.Sleep(time.Second)
 fmt.Println("another way :", k, " : ", v)
 }()
}

map[2:3 0:1 1:2]
one way : 1 : 2
one way : 0 : 1
one way : 2 : 3
another way : 2 : 3
another way : 2 : 3
another way : 2 : 3