nodeJS学习笔记javascript
// node中的全局对象
//console.log()
// 定时器：setTimeout setInterval clearTimeout clearInterval
// 路径： __dirname __filename
// global node.js全局对象是 global javascript的全局对象是window
// node中的模块 module
// const counter = require('./node/stuff.js') //模块导入
// console.log(counter.counter([0.1, 21, 215, 345, 345, 154, 12]), counter.sun())
// 事件模块
// 引入事件模块
/* const events = require('events'); //引入事件模块
// 实例化EventEmitter对象
var myEmitter = new events.EventEmitter()
// 注册事件
myEmitter.on('someEvent',function(msg){
setImmediate(()=>{ //异步事件
console.log('注册事件', msg)
})
})
// 触发事件
myEmitter.emit('someEvent','hello! node.js')//第一个参数是事件名，第二个是实参
console.log('dssadas') */
// 文件系统模块
// 读写文件
//读取文件（fs.readFile）
//写入文件（fs.writeFile）
//1.引入文件系统模块
// const fs = require('fs');
/*
//2.经过对象调用方法 同步读取文件
var user = fs.readFileSync('user.json','utf-8')
console.log(user)
//3.同步写入文件
fs.writeFileSync('user.json',24) */
//异步读写文件
/*
fs.readFile('user.jso','utf-8',function(err,data){
if(err){
console.log(err)
}
console.log(clcledata)
}) */
// 异步必须有回调函数
/* fs.readFile('user.txt', 'utf-8', function (err, data) {
if (err) {
console.log(err)
}
console.log(data)
})
fs.readFile('user.txt','utf8',function(err,data){
if(err) throw err;
fs.writeFile('users.txt',data,function(){
})
})
nodenode
console.log(1121) */
//删除或者增长文件
const fs = require('fs');
//调用删除方法
/* fs.unlink('user.txt',function(){
if(err) throw err;
console.log('文件删除成功！')
}) */
// fs.mkdirSync('stuff')
// fs.rmdirSync('stuff')
//异步建立和删除文件夹
//添加文件夹
/* fs.mkdir('stuff',function(){
fs.writeFile('read.txt',`{ "xiaogeng":{"name": "xiaogeng","age": 24, "love": "no"}}`,function(err,data){
if(err) throw err;
console.log(data)
})
}) */
//删除文件夹 文件夹内若是有文件，则须要先把文件删除
/* fs.unlink('stuff/read.txt',function(err,data){
if(err) throw err;
console.log('文件删除成功!')
fs.rmdir('stuff',function(err,data){
if (err) throw err;
console.log('文件夹删除成功!')
})
}) */
搭建简单的服务器html
//引入服务器模块
const http = require('http')
//建立服务器方法
var server = http.createServer(function (req, res) {
console.log("客户端向服务器发送请求：" + req.url);
res.writeHead(200,{"Content-type":'text/plain'})
res.end('../index.html')
})
//服务器对象监听服务器地址以及端口号
server.listen(8088, '192.168.0.105')
console.log('server is running......')
// 读写数据流
const fs = require('fs');
//读数据流
/* let myReadSteam = fs.createReadStream(__dirname+'/user.txt','utf8')
myReadSteam.on('data',function(chunk){
console.log('=============一部分数据=============')
console.log(chunk)
}) */
let myReadSteam = fs.createReadStream(__dirname + '/user.txt', 'utf8')
// let myWriteSteam = fs.createWriteStream(__dirname+'/wirte2.txt')
// myReadSteam.pipe(myWriteSteam)
// let time = 0;
// myReadSteam.on('data', function (chunk) {
// time++
// console.log('============='+ time +'部分数据=============')
// myWriteSteam.write(chunk)
// })
var http = require('http');
var server = http.createServer(function(req,res){
res.writeHead(200,{'Content-type':'text/plain'})
let myReadSteam = fs.createReadStream(__dirname + '/user.txt', 'utf8')
myReadSteam.pipe(res)
})
server.listen(5000,'192.168.0.105')
const http = require('http')
let server = http.createServer(function(req,res){
res.writeHead(200,{'Content-type':'text/html'});
var myReadStream = fs.createReadStream(__dirname + '/dist/index.html', 'utf8');
myReadStream.pipe(res)
})
server.listen('3000','192.168.0.105')
const http = require('http')
const fs = require('fs')
let server = http.createServer(function(req,res){
if(req.url!=='/favicon.ico'){
console.log('用户正在向客户端发送请求：' + req.url)
if (req.url === '/index' || req.url === '/') {
res.writeHead(200, {
'Content-type': 'text/html'
})
var myReadeSteam = fs.createReadStream('index.html','utf-8')
myReadeSteam.pipe(res)
} else if (req.url === '/home') {
res.writeHead(200, {
'Content-type': 'text/html'
})
var myReadeSteam = fs.createReadStream('home.html', 'utf-8')
myReadeSteam.pipe(res)
} else if (req.url === '/app/app') {
res.writeHead(200, {
'Content-type': 'application/json'
})
var data = [{
"name": "xiaogeng"
},
{
"age": "24"
}];
res.end(JSON.stringify(data))
}
}
})
console.log('server is running.......')
server.listen(3000,'192.168.0.105')
//引入express框架
const express = require('express');
//实例化express对象
const app = new express()
//经过对象调用express方法
// 根据用户访问的地址返回对应信息
/* app.get('/',function(req,res){ //建立访问路径
console.log(req.url)
res.send('this is home page') //返回信息
})
app.get('/app', function (req, res) { //路由
console.log(req.url)
res.send('this is app page')
}) */
//路由参数
app.get('/app/:id', function (req, res) { //路由
console.log(req.url)
res.send('this is app page is :'+req.params.id)
})
//监听服务器端口
app.listen(5000)
// 应用EJS 配置视图引擎
app.set('view engine','ejs')
//路由参数
app.get('/app/:id',function(req,res){
var data = [{age:25,name:['xiaogeng','loveyou']},{age:25,name:['genggeng','aini']}]
res.render('app',{websiteName:req.params.id,data:data})
})
//监听服务器端口
app.listen(5000)
<h1>this is <%= websiteName %> page!</h1>
<h2>我的介绍：</h2>
<ul>
<% data.forEach(function(item){ %>
<li><%= item.name %></li>
<li><%= item.age %></li>
<% })%>
</ul>