func main() {
router := gin.Default()
// 访问路径：/welcome?firstname=Jane&lastname=Doe 输出 "Hello Jane Doe"
router.GET("/welcome", func(c *gin.Context) {
firstname := c.DefaultQuery("firstname", "Guest") // 默认参数
lastname := c.Query("lastname") // 同等 c.Request.URL.Query().Get("lastname")
c.String(http.StatusOK, "Hello %s %s", firstname, lastname)
})
router.Run(":8080")
}