import (
"encoding/json"
"fmt"
)
func main() {
var s = map[string]interface{}{}
var a = map[string]interface{}{"b":11111}
s["nihao"] = map[string]interface{}{"nihao":"dddd","bb":a}
res,_ := json.Marshal(s)
resString := string(res)
fmt.Println(resString)
}