定義結構體

type Btn struct{
  Name string  `json:"name"`
  Type string  `json:"type"`
  Url string   `json:"url"`
  Sub_button  []Btn  `json:"sub_button,omitempty"` //值為空時 直接忽略
  UnShow string `json"-"`  //忽略欄位
}

type menu struct{
  Button []Btn   `json:"button"`
}

結構體命名需要大寫 才會匯出到json串中, 可以通過 struct tag 設定匯出的別名, 可以通過 omitempty 忽略值為空的欄位

示例：

package main

import (
    "encoding/json"
    "fmt"
)

type Btn struct {
    Name       string `json:"name"`
    Type       string `json:"type"`
    Url        string `json:"url"`
    Sub_button []Btn  `json:"sub_button,omitempty"` //值為空時 直接忽略
    UnShow     string `json"-"`                     //
 
忽略欄位
}

type Menu struct {
    Button []Btn `json:"button"`
}

func main() {
    jsonData := Menu{
        Button: []Btn{
            {Name: "home", Type: "view", Url: "https://www.qq.com/auth"},
            {Name: "tool", Sub_button: []Btn{
                {Name: "a1", Type: "view", Url: "https://www.qq.com/a1
 
"},
                {Name: "a2", Type: "view", Url: "https://www.qq.com/a2"},
                {Name: "a3", Type: "view", Url: "https://www.qq.com/a3"},
            }},
            {Name: "other", Sub_button: []Btn{
                {Name: "a1", Type: "view", Url: "https://www.qq.com/a1"},
                {Name: "a2", Type: "view", Url: "https://www.qq.com/a2"},
                {Name: "a3", Type: "view", Url: "https://www.qq.com/a3"},
            }},
        },
    }

    str, err := json.Marshal(jsonData)
    if err != nil {
        panic(err)
    }
    fmt.Println(string(str))

}