The command is returned in the format of []byte

func main() {
  r := gin.Default()
  r.Handle("GET", "/hello", func(context *gin.Context) {  
  context.Writer.Write([]byte("hello,"))
  })
  r.Run()
}

Returns the result as a string

func main() {
  r := gin.Default()
  r.Handle("GET", "/hello", func(context *gin.Context) {  
  context.Writer.WriteString("hello,")
  })
  r.Run()
}

The result is returned in JSON format

r.POST("/hello", func(context *gin.Context) {
  context.JSON(200, map[string]interface{}{
    "code": 1,
    "mess": "succ",
  })
  })

JSON method is used to return JSON format. The first parameter is the HTTP request status code, and the second parameter is map[string]interface{}.

You can also replace the map type with a construct

r.POST("/hellojson", func(context *gin.Context) {
  res := Result{
    Code: 1,
    Msg:  "ok",
  }
  context.JSON(200, &res)
})
type Result struct {
  Code int
  Msg  string
}

The difference between the two is that one passes a map and the other passes a structure.

Return the result as HTML

context.HTML(http.StatusOK,"./index.html",gin.H{
    "name":"fq",
})

The first parameter is again the HTTP status code, the second parameter is the page, and the third parameter is the parameter passed from the background to the front end.