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')
})