nodeJs 学习

 

常用快捷键

 二、fs模块

回调函数为空，则表示写入成功！

练习

const fs = require('fs');
fs.readFile('../files/成绩.txt', 'utf-8', (err, dataStr) => {if (err) {console.log('读取失败');return err;}console.log('读取成功');const arr = dataStr.split(' ')const newArr = arr.map(item => item.replace('=', ':'));fs.writeFile('../files/02.txt', newArr.join('\r\n'), (err) => {if (err) {console.log('写入失败');return;}console.log('写入成功');})
})

fs模块，路径动态拼接，与执行的时候路径有关；

const fs = require('fs')fs.readFile('D:\\ty\\code\\nodeJs\\nodeDemo01\\files\\02.txt', 'utf-8', (err,data) => {console.log(1,err,data)
})fs.readFile(__dirname+'../../files/02.txt', 'utf-8', (err,data) => {console.log(2,err,data)
})

path模块

获取路径中的文件名

获取路径中的文件扩展名

案例

完整代码： 

const fs = require('fs');
const path = require('path');const regStyle = /<style>[\s\S]*<\/style>/;
const regScript = /<script>[\s\S]*<\/script>/;
fs.readFile(path.join(__dirname, '../files/ty.html'), 'utf-8', (err, data) => {if (err) {return;}console.log(data)resolveCss(data)resolveJs(data)resolveHtml(data);})function resolveCss (htmlStr) {const r1 = regStyle.exec(htmlStr);// console.log(r1)const newCss = r1[0].replace('<style>', '').replace('</style>', '');// console.log(newCss)fs.writeFile(path.join(__dirname, './clock/index.css'), newCss, err => {console.log(err)})
}function resolveJs (htmlStr) {const r1 = regScript.exec(htmlStr);console.log(r1)const newJs = r1[0].replace('<script>', '').replace('</script>', '');console.log(newJs)fs.writeFile(path.join(__dirname, './clock/index.js'), newJs, err => {console.log(err)})
}function resolveHtml (htmlStr) {const newHtml = htmlStr.replace(regStyle, '<link rel="stylesheet",href="./css"></link>').replace(regScript, '<script src="./index.js"></script>');fs.writeFile(path.join(__dirname, '/clock/index.html'), newHtml, err => {console.log(err)})
}

三http模块

const http = require('http');const server = http.createServer();server.on('request', function(req, res) {console.log('请求了')
})server.listen(8080, () => {console.log('服务器已启动：http://127.0.0.1:8080')
})

根据不同的url相应不同的内容

四、模块化