在go中使用omitempty的代碼實例

package main
import (
  "encoding/json"
  "fmt"
)
type Person struct {
  Name string `json:"name"`
  Age int  `json:"age"`
  Addr string `json:"addr,omitempty"`
}
func main() {
  p1 := Person{
    Name: "taoge",
    Age: 30,
  }
  data, err := json.Marshal(p1)
  if err != nil {
    panic(err)
  }
  fmt.Printf("%s\n", data)
  fmt.Println(p1.Name, p1.Age, p1.Addr)
  p2 := Person{
    Name: "Cang Laoshi",
    Age: 18,
    Addr: "Japan",
  }
  data2, err := json.Marshal(p2)
  if err != nil {
    panic(err)
  }
  fmt.Printf("%s\n", data2)
  fmt.Println(p2.Name, p2.Age, p2.Addr)
}