本文实例讲述了node省市区三级数据性能测评。分享给大家供大家参考，具体如下：
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！
后续版本继续优化，也欢迎有相关方面经验的大神留言探讨，给出更好的方案。
希望本文所述对大家node.js程序设计有所帮助。
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