学习笔记 内容待商榷 欢迎评论区指出错误

1.导入模块

const http = require('http')
const url = require('url')
const path = require('path')
const fs = require('fs')
const mime = require('mime') 

mime模块获取文档type类型 

app.on('request', (req, res) => {
    // let pathname = url.parse(req.url).pathname
    let pathname = req.url //获取路径 默认是'/'
    //console.log(req.url);
    pathname = pathname == '/' ? '/default.html' : pathname

    let realpath = path.join(__dirname, 'public' + pathname)//__dirname 指向绝对路径 path.join会把字符串拼接起来 攒成路径
    let type = mime.getType(realpath);
    fs.readFile(realpath, (error, result) => {
        if (error != null) {
            res.writeHead(404, {
                'content-type': 'text/html;charset=utf8'
            })
            res.end('文件读取失败')
            return
        }
        res.writeHead(200, {
            'content-type': type         //向客户端发送响应头 指定里面响应的个文件的类型
        })
        res.end(result)
    })

})