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if(res.data.code===0){
//do something
}else if(res.data.code===1002){
//do something
}else if(res.data.code===1004){
//do something
}else{
//do something
}

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const StatusCode = new Map(
[[401,'请求错误'],[402,'未授权'],[403,'拒绝访问']]
);
StatusCode.get(401) //'请求错误'
StatusCode.set(401,'My lord,the time has changed!')
StatusCode.get(401) //'My lord,the time has changed!'
StatusCode.set([404,'first'],[404,'second'])
StatusCode.get(404) //second

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	const _this = this;
    const StatusCode = new Map([
      [
        401,
        async () => {
          console.log(_this.requset(params));
        }
      ],
      [
        402,
        () => {
          console.log("未授权");
        }
      ],
      [
        403,
        () => {
          console.log("拒绝访问");
        }
      ]
    ]);
    const ShowMessage = code => {
      //Map对象转数组
      [...StatusCode].forEach(([key, value]) => {
        key === code ? value.call() : "";
      });
    };
    ShowMessage(402) //'未授权'