前端 xx.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script src="https://cdn.bootcss.com/qs/6.7.0/qs.min.js"></script>
<title>Document</title>
</head>
<body>
<button class="btn1">获取数据</button>
<button class="btn2">新增数据</button>
<button class="btn3">修改数据</button>
<button class="btn4">删除数据</button>
<script>
var qs = Qs
let btn1 = document.getElementsByClassName('btn1')[0]
let btn2 = document.getElementsByClassName('btn2')[0]
let btn3 = document.getElementsByClassName('btn3')[0]
let btn4 = document.getElementsByClassName('btn4')[0]
function getxx(method, path, redata = {}) {
return new Promise((resolve, reject) => {
axios({
url: `http://localhost:8111/${path}`,
method,
[method.toLowerCase() === 'get' ? 'params' : 'data']: redata
// params: {},
// data:{},
}).then((res) => {
resolve(res)
})
})
}
btn1.addEventListener('click', async () => {
let resutl = await getxx('get', 'getPeople')
console.log(resutl)
})
btn2.addEventListener('click', async () => {
let resut2 = await getxx('post', 'submitPeople', qs.stringify({ pwd: 123456, name: 'duobear1' }))
// let resut2 = await getxx('post', 'submitPeople', JSON.stringify({ firstName: 'Fred', lastName: 'duoe' })) //效果不好
// let resut2 = await getxx('post', 'submitPeople', { firstName: 'Fred', lastName: 'duoe' }) //不行
console.log(resut2)
})
btn3.addEventListener('click', async () => {
let resut3 = await getxx('post', 'updatePeople', qs.stringify({ id: 5, name: 'duobear888' }))
console.log(resut3)
})
btn4.addEventListener('click', async () => {
let resut4 = await getxx('post', 'delPeople', qs.stringify({ id: 5 }))
console.log(resut4)
})
</script>
</body>
</html>
后端 xx.js文件
const express = require('express');
const mysql = require('mysql');
// const bodyParser = require("body-parser");
const cors = require('cors');
const app = express()
app.use(cors())
// app.use(bodyParser.urlencoded({ extended: false }));
app.use(express.urlencoded({ extended: false }))
// 创建连接对象 createPool
// createConnection connection
const connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: 'root',
port: 3307,
database: 'demo1'
})
// 查询数据
app.get('/getPeople', (req, res) => {
connection.query('select * from users', (err, results, fields) => {
if (err) {
result = { warn: 'err', message: '获取数据库时发生搓搓' }
res.send(JSON.stringify(result))
} else {
res.send(JSON.stringify(results))
}
})
})
// 插入数据
app.post('/submitPeople', (req, res) => {
const sql = 'insert into users set ?';
connection.query(sql, req.body, function (error, results) {
if (error) {
result = { warn: 'err', message: '插入数据库时发生搓搓' }
res.send(JSON.stringify(result))
} else {
res.send(JSON.stringify({ msg: 'ok', results: results.insertId }))
}
});
})
// 更新数据
app.post('/updatePeople', (req, res) => {
const updatesql = 'update users set name = ? where id= ?';
const { id, name } = req.body
const arrdata = [name, id]
// const arrdata = ['duobear999', 5]
connection.query(updatesql, arrdata, function (error, results) {
if (error) {
result = { warn: 'err', message: '更新 数据库时发生搓搓' }
res.send(JSON.stringify(result))
} else {
res.send(JSON.stringify({ msg: 'ok', results: results.affectedRows }))
}
});
})
// 删除数据
app.post('/delPeople', (req, res) => {
const delsql = 'delete from users where id= ?';
const { id } = req.body
connection.query(delsql, id, function (error, results) {
if (error) {
result = { warn: 'err', message: '删除 数据库时发生搓搓' }
res.send(JSON.stringify(result))
} else {
res.send(JSON.stringify({ msg: 'ok', results: results.affectedRows }))
}
});
})
app.listen(8111, () => {
console.log('服务器已经启动')
})
package.json
{
"dependencies": {
"body-parser": "^1.20.2",
"cors": "^2.8.5",
"express": "^4.18.2",
"mysql": "^2.18.1"
}
}
navicat
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后端启动服务
1，需要提前下载好依赖
2：node xx.js 启动后端服务
前端启动服务
主要借助vscode中的插件live server，运行静态文件xx.html
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