test/map/map_test.go

package map_test

import (
	"encoding/json"
	"testing"
)

func TestNoOrderMap(t *testing.T) {
	mm := map[string]string{}

	mm["m"] = "m"
	mm["a"] = "a"
	mm["p"] = "p"
	mm["o"] = "o"
	mm["r"] = "r"
	mm["d"] = "d"

	// map 无序
	for k := range mm {
		println(k)
	}

	// json.Marshal 固定key顺序
	bs, _ := json.Marshal(mm)
	println(string(bs))
}