摘要： 本文要实现的内容，使用nodejs 对文件的增删改查，演示的例子-》分离出一个html 文件里面的script 和style 里面的内容，然后单独生成js文件和css 文件。中间处理异步的api-》async/await , Promise
项目托管：extract-js-css , 欢迎star
直接上代码：
// 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 href="https://www.jb51.net/article/test.css" >'; let jsrc = '<script src="https://www.jb51.net/article/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============================='); })()
代码确实没什么好解释的，慢慢看就明白了。需要提醒以下：