golang 一些坑 rang

type Tmp struct {
        Name string
        Age  int
    }


func main(
data := []Tmp{
        {"zhangsan", 18},
        {"lisi", 22},
        {"wangwu", 15},
    }

    for _, v := range data {
        v.Age = 999
    }

    fmt.Println(data)

    for i := 0; i < len(data); i++ {
        data[i].Age = 999
    }
    fmt.Println(data)


)

range data 对于切片操作是值操作,并不是指针操作,所以业务中最好使用len(data)索引方式对值进行操作

result:

[{zhangsan 18} {lisi 22} {wangwu 15}]
[{zhangsan 999} {lisi 999} {wangwu 999}]