当需要接口返回错误信息的时候

尽量不要硬编码在接口返回对方

可以封装一个错误码类

类似下面这样

演示

types/api_code.go

package types

type Codes struct {
    SUCCESS   uint
    FAILED    uint
    CnMessage map[uint]string
    EnMessage map[uint]string
    LANG      string
}

var ApiCode = &Codes{
    SUCCESS: 20000,
    FAILED:  40000,
    LANG:    "cn",
}

func init() {
    ApiCode.CnMessage = map[uint]string{
        ApiCode.SUCCESS: "操作成功",
        ApiCode.FAILED:  "操作失败",
    }
    ApiCode.EnMessage = map[uint]string{
        ApiCode.SUCCESS: "succeed",
        ApiCode.FAILED:  "failed",
    }
}
func (c *Codes) GetMessage(code uint) string {
    if c.LANG == "cn" {
        message, ok := c.CnMessage[code]
        if !ok {
            return ""
        }
        return message
    } else {
        message, ok := c.EnMessage[code]
        if !ok {
            return ""
        }
        return message
    }
}

测试使用

package types

import "testing"

func TestApiCode(t *testing.T) {
    t.Log(ApiCode.GetMessage(ApiCode.SUCCESS))
}