golang不规则json解析

type Data struct {

    Type string      `json:"type"`

    Id   interface{} `json:"id"`}func decode(t string) {    var x Data

    err := json.Unmarshal([]byte(t), &x)    if err != nil {        panic(err)

    }    if x.Type == "a" {

        fmt.Println(x.Id.(string))

    } else {

        fmt.Println(x.Id.(float64)) //json解析中number默认作为float64解析

    }

}func main() {

    t1 := `{"type":"a", "id":"aaa"}`

    t2 := `{"type":"b", "id":22222}`

    decode(t1)

    decode(t2)

}

aaa

22222