1.无法忽略掉嵌套结构体，可以通过定义为指针类型来解决

  package test
  import (
    jsoniter "github.com/json-iterator/go"
    "testing"
  type People struct {
    Name string `json:"name"`
    Age  int    `json:"age,omitempty"`
    Info Info   `json:"info,omitempty"`
  type Info struct {
    Height int `json:"height"`
    Weight int `json:"weight"`
  func TestJson(t *testing.T) {
    people := People{}
    str := `{
        "name": "testName",
        "age": 0
    err := jsoniter.UnmarshalFromString(str, &people)
    if err != nil {
        return
    toString, _ := jsoniter.MarshalToString(people)
    t.Logf("%s", toString)  // {"name":"testName","info":{"height":0,"weight":0}}
  ------------------------------
  // 重新定义结构体
  type People struct {
    Name string `json:"name"`
    Age  int    `json:"age,omitempty"`
    Info *Info  `json:"info,omitempty"`
  type Info struct {
    Height int `json:"height"`
    Weight int `json:"weight"`
  // {"name":"testName"}

2.如果字段标签有omitempty，恰巧默认值是有意义的，这个时候也会忽略掉，解决办法也是通过定义为指针类型来解决

package test
import (
    jsoniter "github.com/json-iterator/go"
    "testing"
type People struct {
    Name string `json:"name"`
    Age  *int   `json:"age,omitempty"`  // 定义为指针类型
func TestJson(t *testing.T) {
    people := People{}
    str := `{
        "name": "testName",
        "age": 0
    err := jsoniter.UnmarshalFromString(str, &people)
    if err != nil {
        return
    toString, _ := jsoniter.MarshalToString(people)
    t.Logf("%s", toString)  // {"name":"testName","age":0}
// 结构体初始化
func TestJson1(t *testing.T) {
    age := 0
    people := People{
        Name: "testName",
        Age:  &age,
    toString, _ := jsoniter.MarshalToString(people)
    t.Logf("%s", toString)  // {"name":"testName","age":0}