vue请求按顺序执行的示例详解

      first().then(response1 => {
        //第一次请求
        this.form = response1.data;
        console.log("第一次请求")
        //发送第二次请求
        return second(this.form.Code);
      }).then(response2 => {
      	console.log("第二次请求")
        //处理第二次请求返回结果
        this.queryParams=response2.data
      })

      getLastDataByUnifiedNumber(this.form.unifiedNumber).then(response1 => {
        //第一次请求查询采样表数据
        this.form = response1.data;
        this.form.address = this.form.provinceName + this.form.cityName + this.form.countyName;
        this.queryParams=this.form;
        return getListBySamplingCode(this.form.samplingCode);
      }).then(response2 => {
        //第二次请求查询测试结果数据
        this.form2 = response2.rows[0];
        if(this.form2){
          this.queryParams.alkaliHydrolyzedNitrogenFirst=this.form2.alkaliHydrolyzedNitrogenFirst;
          this.queryParams.availablePhosphorusFirst=this.form2.availablePhosphorusFirst;
          this.queryParams.availableKFirst=this.form2.availableKFirst;
          this.queryParams.organicMatterFirst=this.form2.organicMatterFirst;
        }
      })