node+koa实现数据mock接口的方法

// server.jsconst Koa = require('koa');const Router = require('koa-router');const qs = require('qs');const assert = require('assert');const app = new Koa();const router = new Router();/** * 获取列表数据 * @param {request} page 页数 * @param {request} limit 每页数据条数 * @param {response} errno 返回状态码 0 ==> 返回成功 1 ==> 有错误 * @param {response} hasMore 是否有更多数据 */let listData = require('./mock/list/list.js');router.get('/api/getlist/:page/:limit', function (ctx, next) {    const page = ctx.params.page;  const limit = ctx.params.limit;  const maxPage = listData.length / limit;    // 构造返回对象  let res = {    errno: 0,    data: {      hasMore: true,      data: []    }  };  // 如果超过最大页面数  if ((page*1 + 1) >= maxPage) {    res.data.hasMore = false;  }  res.data.data = listData.slice(page*limit, page*limit + limit);   ctx.body = res;});/** * 获取详情数据 * @param {request} id 商品id */const detailData = require('./mock/detail/detail.js');router.get('/api/getdetail/:id', function (ctx, next) {  const id = ctx.params.id  let res = {    errno: 0,    data: {      data: []    }  }  res.data.data = detailData;  // todo...  ctx.body = res;});/** * 提交评论 * @param {request} id 用户id * @param {request} uid 商品id * @param {request} msg 评论内容 */router.post('/api/comment', function (ctx, next) {    const params = qs.parse(ctx.req._parsedUrl.query);  const id = params.id;  const uid = params.uid;  const msg = params.msg;  if (id === undefined || uid === undefined || msg === undefined) {    ctx.body = {      errno: 1,      msg: '缺少参数'    }  } else {    // todo...    ctx.body = {      errno: 0,      msg: '评论成功'    }  }});app .use(router.routes()) .use(router.allowedMethods());app.listen(3000);console.log("server is running at http://localhost:3000/");

module.exports = {  ...  devServer: {    proxy: {     // 将 `/api` 开头的 http 请求，都代理到 `localhost:3000` 上，由 koa 提供 mock 数据     '/api': {      target: 'http://localhost:3000',      secure: false     }    }    ...  }}