1、安装express命令
cnpm install express --save
2、使用方法
var express = require('express');
var app = express();
app.get('/', function (req, res) {res.send('Hello World');})
var server = app.listen(8081)
3、内置的中间件 express.static
使用 express.static 中间件来设置静态文件路径。app.use(express.static('public'));
4、get请求:req.query获取发送的数据
//index.html文件
<!DOCTYPE html>
<html>
<body>
<form action="http://localhost:8081/getmethod" method="GET">
First Name: <input type="text" name="first_name"> <br>
Last Name: <input type="text" name="last_name">
<input type="submit" value="Submit">
</form>
</body>
</html>
//请求文件server.js
var express = require('express');
var app = express();
app.use(express.static('public'));
app.get('/index.html',function(req,res){
res.sendFile(__dirname + '/'+'index.html')
})
app.get('/getmethod',function(req,res){
var data = req.query;
console.log(req.query)
res.send(req.query);
})
app.listen(8081)
执行：node server
浏览器访问：http://localhost:8081/index.html
5、post请求:req.body获取发送的数据
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="http://localhost:8082/process_post" method="post">
first name:<input type="text" name="first_name"/><br />
last name: <input type="text" name="last_name" />
<input type="submit" value="submit"/>
</form>
</body>
</html>
//请求文件server.js
var express = require('express');
var app = express();
app.listen('8082')
app.use(express.json())
app.use(express.urlencoded({extended:true}))
app.use('/post.html',function(req,res){
res.sendFile(__dirname + '/'+'post.html')
})
app.use('/process_post',function(req,res){
var data = req.body;
console.log(data);
res.send(data)
})
执行：node server
浏览器访问：http://localhost:8082/index.html
6、express.router()