Node.js框架Express学习

安装express

npm i express 

1.请求与响应

var express = require("express");
var bodyparser = require("body-parser");

var app = express();
app.use(bodyparser.urlencoded({extended:false}));


// app.get("/",function(request,response){
//     response.send("test"+request.query.id);
// })

// app.get("/detail/:id",function(request,response){
//     response.send("test"+request.params.id);
// })

app.post("/",function(request,response){
    response.send("Hello POST");
})
app.listen(20000);
console.log("Server start on 127.0.0.1:20000");

2.文件上传

npm i --save multer

var express = require("express");
var bodyparser = require("body-parser");
var multer = require("multer");
var upload = multer({dest:"uploads/"});

var app = express();
app.use(bodyparser.urlencoded({extended:false}));

// 这里的avatar就是使用post请求方式时参数
app.post("/upload",upload.single('avatar'), function(request,response){
    response.send("upload success");
})
app.listen(20000);
console.log("Server start on 127.0.0.1:20000");

可指定文件存储地址以及文件名：
var express = require("express");
var bodyparser = require("body-parser");
var fs = require("fs");
var multer = require("multer");
var upload = multer({
    storage: multer.diskStorage({
        destination: function (req, file, callback) {
            callback(null, "./uploads")
        },
        filename: function (req, file, callback) {
            callback(null, file.originalname)
        }
    })
});
var app = express();
app.use(bodyparser.urlencoded({
    extended: false
}));