闲来无事，测试下node和egg
首先是数据库，大概长这样
然后是代码
'use strict'; const Controller = require('egg').Controller; class HomeController extends Controller { async index() { const { ctx } = this; ctx.body = 'hi, egg'; } async city() { const { ctx } = this; console.time("sql") const provinces = await this.app.mysql.select('provinces') const citys = await this.app.mysql.select('cities') const areas = await this.app.mysql.select('areas') console.timeEnd("sql") console.time('cal') provinces.forEach(province => { let provinceid = province.provinceid province.children = [] citys.forEach(city => { city.children = [] if (city.provinceid === provinceid) { province.children.push(city) } let cityid = city.cityid areas.forEach(area => { if (area.cityid === cityid) { city.children.push(area) } }) }) }) console.timeEnd('cal') const result = { status: 1, data: provinces, } ctx.body = result; } } module.exports = HomeController;
执行时间：
接着改进
'use strict'; const Controller = require('egg').Controller; class HomeController extends Controller { async index() { const { ctx } = this; ctx.body = 'hi, egg'; } async city() { const { ctx } = this; console.time("sql") let provinces = await this.app.mysql.select('provinces') let citys = await this.app.mysql.select('cities') let areas = await this.app.mysql.select('areas') console.timeEnd("sql") console.time('cal') for (let i = 0, len = citys.length; i < len; i++) { let city = citys[i] city.children = [] let cityid = city.cityid for (let j = 0, len1 = areas.length; j < len1; j++) { let area = areas[j] if (area.cityid === cityid) { city.children.push(areas.splice(j, 1)[0]) len1-- j-- } } } provinces.forEach(province => { let provinceid = province.provinceid province.children = [] for (let i = 0, len = citys.length; i < len; i++) { let city = citys[i] if (city.provinceid === provinceid) { province.children.push(city) citys.splice(i, 1) len-- i-- } } }) console.timeEnd('cal') const result = { status: 1, data: provinces, } ctx.body = result; } } module.exports = HomeController;
本次优化结果
可以看到，在组装数据的过程中，时间缩短了近20倍！