common/ResponseResult

type ResponseResultParams<T> = Partial<{
  code: number;
  msg: string;
  data: T;
}>;

class ResponseResult<T = any> {
  code: number;
  msg: string;
  data?: T;
  constructor({ code = 0, msg = '请求成功', data }: ResponseResultParams<T>) {
    this.code = code;
    this.msg = msg;
    if (data) this.data = data;
  }
}

export default ResponseResult;

module

import { Controller, Get, Query } from '@nestjs/common';
import { RangeService } from './range.service';

@Controller('range')
export class RangeController {
  constructor(private rangeService: RangeService) {}

  @Get()
  getRange(@Query('range') range: string) {
    return this.rangeService.getRange(range);
  }
}

service

import { Injectable } from '@nestjs/common';
import ResponseResult from '../common/ResponseResult';

@Injectable()
export class RangeService {
  getRange(range: string): ResponseResult<Array<string>> {
    // 类型转换
    const realRange: number = +range;
    if (isNaN(realRange)) {
      return new ResponseResult({
        code: 1,
        msg: 'range参数请填写数字字符串',
      });
    }

    // 判断是否越界
    if (realRange < 0) {
      return new ResponseResult({
        code: 2,
        msg: 'range参数请填写一个>= 0的数字字符串',
      });
    }

    // 参数正确
    const arr: Array<string> = [];
    if (realRange > 0) {
      for (let i = 1; i <= realRange; i++) {
        arr.push(`${i}`);
      }
    }

    return new ResponseResult({
      data: arr,
    });
  }
}