package main

import (
  "fmt"
  "net/http"
  "reflect"
  "strings"

  "github.com/gin-gonic/gin"
)

func main() {
  r := gin.Default()
  r.GET("defaultQuery", defaultQuery)
  r.Run()
}

func defaultQuery(c *gin.Context) {
  c.JSON(http.StatusOK, gin.H{
    "id_":   c.DefaultQuery("id", "100"),
    "name_": c.Query("name"),
  })
}

如果不传参数​​id​​，那么将使用默认值

​​​http://localhost:8080/defaultQuery?name=张三​​​

go gin框架：DefaultQuery给请求参数赋默认值_json