请问为什么会出现属性名未定义的情况

Question

     request.post("/dianzan/pan",this.dianzan,config).then(res => {
        if(res){
          console.log(res)
          console.log(test)
          this.test=0;
        }else{
          console.log(test)
          this.test=1;
        }
      })

Answer 1