nodejs分离html文件里面的js和css的方法

// import fs from 'fs'
var fs = require('fs')
// import csscomb from 'csscomb'
// var csscomb = require('csscomb')
// var comb = new csscomb('zen');
// console.log(comb)

// 删除文件
const deleteFile = (path)=>{
  return new Promise(resolve => {
    fs.unlink(path, (err) => {
      if (err) {
        console.log(err)
        return
      };
      console.log(`已成功删除 ${path}文件`);
      resolve()
    });
  })
}

// 删除文件夹
const deleteDir = async (path)=>{
  let _files = await new Promise (resolve => {
    fs.readdir(path, (err,files) => {
      if (err) {
        console.log(err)
      };
      console.log(`已成功读取 ${path} 文件夹`);
      resolve(files)
    })
  })

  if(_files && _files.length) {
    for(let i =0;i<_files.length;i++) {
      // console.log(_files[i],'innnnnn')
      await deleteFile('./test/'+ _files[i])
    }
  }
  // console.log('delete hou')

  await new Promise(resolve => {
    fs.rmdir(path, (err) => {
      if (err) {
        console.log(err)
      };
      console.log(`已成功删除空 ${path}文件夹`);
      resolve()
    })
  });
}
const emptyDir = (path) => {
  return new Promise(resolve => {
    fs.rmdir(path, (err) => {
      if (err) {
        console.log(err)
      };
      console.log(`已成功删除空 ${path}文件夹`);
      resolve()
    })
  })
}
// 新建文件夹
/**
 * 
 */
const mkdirTest = ()=>{
  return new Promise(resolve => {
    fs.mkdir('./test', { recursive: true }, (err, data)=>{
      if (err) {
        console.log(err)
      };
      console.log('新建文件夹成功')
      resolve()
    })
  })
}

// 读取html 内容
/**
 * 
 */
const readHtml = ()=>{
  return new Promise(resolve => {
    fs.readFile('./test.html', 'utf-8', (err, data)=>{
      if(err) {
        throw Error(err)
      }
      console.log('test.html 读取成功！--NO1')
      resolve(data)
    })
  })
}

// 写入css 和js
/**
 * 向文件中追加内容
 * @param {是文件名字} path 
 * @param {写入文件的内容} data 
 * @param {文件类型} type 
 * @author erlinger
 * @time 
 */
const appendFile = (path, data, type) => {
  return new Promise(resolve => {
    fs.appendFile(path, data, (err) => {
      if (err) {
        console.log(err)
      };
      console.log(`${type}数据已追加到文件`);
      resolve()
    });
  })
}
// 写一个html
const writeHtml = (path, data) => {
  return new Promise(resolve => {
    fs.writeFile(path, data, (err) =>{
      if(err) {
        console.log('err', err)
        return
      }
      console.log(`${path} 写入成功，功能结束!`);
      resolve() // 必须resolve 。不然 promise 就到此为止，调用该方法后面的代码将不执行
    })
  })
}

// 插件 方法入口
(async ()=>{
  console.log('==========================game-start=============================');
  await deleteDir('./test');
  console.log('我应该是等---删除文件夹后---才出现')

  await mkdirTest();
  console.log('我应该是在---文件夹新建成功---后出现！');

  let cssReg = /<style>[\s|\S]*?<\/style>/ig;
  let jsReg = /<script>[\s|\S]*?<\/script>/ig;
  let allStyleReg = /<\/style>[\s|\S]*?<style>/ig;
  let allScriptReg = /<\/script>[\s|\S]*?<script>/ig;
  let cssLink = '<link rel="stylesheet" href="./test.css" rel="external nofollow" >';
  let jsrc = '<script src="./test.js"></script>';
  let styleCollection, scriptColletion;
  let cssContent = '', jsContent = '', htmlContentStr = '';

  let originContent = await readHtml();
  styleCollection = originContent.match(cssReg);
  scriptColletion = originContent.match(jsReg);
  
  // 处理 css
  for (let i =0;i<styleCollection.length;i++) {
    cssContent += JSON.stringify(styleCollection[i]);
  }

  cssContent = cssContent.replace(/<style>/g,'').replace(/<\/style>/g, '').replace(/("")/g,'')
  
  for (let i =0;i<scriptColletion.length;i++) {
    jsContent += JSON.stringify(scriptColletion[i]);
  }
  
  jsContent = jsContent.replace(/<script>/g,'').replace(/<\/script>/g, '')
  .replace(/<\/script>"*<script>/g, '').replace(/("")/g,'')
  
  await appendFile('./test/test.css', JSON.parse(cssContent), 'css');
  console.log('我应该是在---css写入成功---后出现！');

  await appendFile('./test/test.js', JSON.parse(jsContent), 'js');
  console.log('我应该是在---js写入成功---后出现！');

  htmlContentStr = originContent
  .replace(allStyleReg, '')
  .replace(cssReg, cssLink)
  .replace(allScriptReg, '')
  .replace(jsReg, jsrc);
  console.log('copyTest.html 文本已经格式化，准备写入');
  await writeHtml('./test/copyTest.html', htmlContentStr);

  console.log('==========================game-over=============================');
})()