如何使用nodejs分離html文件里的js和css（代碼示例）

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

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

// 刪除文件夾
const deleteDir = async (path)=>{
 let _files = await new Promise (resolve => {
 fs.readdir(path, (err,files) => {
 if (err) {
 console.log(err)
 };
 console.log(`已成功讀取 ${path} 文件夾`);
 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(`已成功刪除空 ${path}文件夾`);
 resolve()
 })
 });
}
const emptyDir = (path) => {
 return new Promise(resolve => {
 fs.rmdir(path, (err) => {
 if (err) {
 console.log(err)
 };
 console.log(`已成功刪除空 ${path}文件夾`);
 resolve()
 })
 })
}
// 新建文件夾
/**
 * 
 */
const mkdirTest = ()=>{
 return new Promise(resolve => {
 fs.mkdir('./test', { recursive: true }, (err, data)=>{
 if (err) {
 console.log(err)
 };
 console.log('新建文件夾成功')
 resolve()
 })
 })
}

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

// 寫入css 和js
/**
 * 向文件中追加內(nèi)容
 * @param {是文件名字} path 
 * @param {寫入文件的內(nèi)容} data 
 * @param {文件類型} 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(`${type}數(shù)據(jù)已追加到文件`);
 resolve()
 });
 })
}
// 寫一個(gè)html
const writeHtml = (path, data) => {
 return new Promise(resolve => {
 fs.writeFile(path, data, (err) =>{
 if(err) {
 console.log('err', err)
 return
 }
 console.log(`${path} 寫入成功，功能結(jié)束!`);
 resolve() // 必須resolve 。不然 promise 就到此為止，調(diào)用該方法后面的代碼將不執(zhí)行
 })
 })
}

// 插件 方法入口
(async ()=>{
 console.log('==========================game-start=============================');
 await deleteDir('./test');
 console.log('我應(yīng)該是等---刪除文件夾后---才出現(xiàn)')

 await mkdirTest();
 console.log('我應(yīng)該是在---文件夾新建成功---后出現(xiàn)！');

 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">';
 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);
 
 // 處理 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('我應(yīng)該是在---css寫入成功---后出現(xiàn)！');

 await appendFile('./test/test.js', JSON.parse(jsContent), 'js');
 console.log('我應(yīng)該是在---js寫入成功---后出現(xiàn)！');

 htmlContentStr = originContent
 .replace(allStyleReg, '')
 .replace(cssReg, cssLink)
 .replace(allScriptReg, '')
 .replace(jsReg, jsrc);
 console.log('copyTest.html 文本已經(jīng)格式化，準(zhǔn)備寫入');
 await writeHtml('./test/copyTest.html', htmlContentStr);

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

node extract-js-css