听到同事说没找到压缩js文件的，说软件压缩貌似有点问题，我自己就用nodejs练手般写了压缩文件的。
主要的思路就是，先通过前端上传js文件，然后服务器接收，然后引用uglifyjs 压缩，再返回文件路径给前端下载即可。代码如下：
html:
<div> ???????<div class="content"> ???????????<span>js压缩工具</span> ???????????<form ?id="uploadFiles" enctype="multipart/form-data"> ????????????????<input type="file" id=‘uglifyJs‘ multiple="multiple" name="js_min"> ???????????????<input type="hidden" name="test" value="heyden"> ???????????</form> ???????????<button id="upload">压缩</button> ???????</div> ???</div>
js 脚本
$(function() { ???var baseUrl = location.hostname ???$("#upload").click(function() { ???????$.ajax({ ???????????url:`http://${baseUrl}:8084/upload`, ???????????type:‘POST‘, ???????????data: new FormData($(‘#uploadFiles‘)[0]), ???????????processData:false, ???????????contentType:false, ???????????success: function(res) { ???????????????res.fileData.forEach(item => { ???????????????????let elDown = document.createElement(‘a‘), ???????????????????????e = document.createEvent("MouseEvents"); //创建鼠标事件对象 ???????????????????e.initEvent("click", false, false); //初始化事件对象 ???????????????????elDown.href = item.downUrl ???????????????????elDown.download = item.fileName; ???????????????????elDown.dispatchEvent(e); //给指定的元素，执行事件click事件 ???????????????}); ???????????}, ???????????error: function() { ???????????} ???????}) ???})})这里ajax请求时。processData，contentType这两个记得填，否则会被坑
nodejs :
const express = ?require(‘express‘);const ?app = express()const formidable = require(‘formidable‘);const fs = require(‘fs‘)const path = require(‘path‘)const UglifyJS = require(‘uglify-js‘)const multiparty = require(‘multiparty‘);let ?form = nullapp.use(express.static(‘static‘))app.get(‘/‘, function(req, res) { ???res.sendfile(‘index.html‘)})app.post(‘/upload‘, function(req, res) { ???form = new multiparty.Form(); ???form.uploadDir = ‘static/tmp‘ ???form.maxFieldsSize = 1 * 1024 * 1024; ???var targetDir = path.join(__dirname, ‘/static/upload‘) ????fs.access(targetDir, function (err) { ???????if (err) { ???????????fs.mkdir(targetDir); ???????} ???????_fileSave(req, res, targetDir) ???})})app.listen(8084, "0.0.0.0" ,() => { ???console.log(‘succcess in port 8084‘); ???})function _fileSave(req, res, target) { ???form.parse(req, function (err, fields, files) { ???????if (err) throw err ???????var fileData = []; ???????var errCount = 0; ???????var keys = files.js_min ???????var miniJs = [] ???????keys.forEach(function(key, index) { ???????????var filePath = key.path; ???????????var fileExt = filePath.substring(filePath.lastIndexOf(‘.‘)); ???????????if ((‘.js.txt‘).indexOf(fileExt.toLowerCase()) === -1) { ???????????????errCount += 1; ???????????} else { ???????????????var fileName = fileExt; ???????????????var targetFile = target + ‘/‘ + key.originalFilename ; ???????????????var fileUrl = req.originalUrl +"/"+ key.originalFilename ???????????????//移动文件 ???????????????miniJs.push(UglifyJS.minify(fs.readFileSync(filePath, ‘utf8‘))) ???????????????fs.writeFileSync(targetFile, miniJs[index].code, "utf8") ???????????????fs.unlinkSync(filePath); ???????????????// 文件的Url（相对路径） ???????????????fileData.push({ target: targetFile, downUrl: fileUrl, fileName: key.originalFilename}) ???????????} ???????}) ???????????????res.json({ fileData: fileData, success: keys.length - errCount, error: errCount, result: miniJs}); ???})}写服务时，接收前端的文件时，调接口时，form 对象记得调一次就new一个，否则会报错。，，获取前端文件后，只需用UglifyJS处理，然后重命名临时文件即可，最后返回
文件url给前端，让前端自己下载。这里我也不知道怎么直接让前端自动下载，貌似通过请求不好下载，自己也没找到方法，求靠前端js解决咯
js 压缩
原文地址：https://www.cnblogs.com/ylHeyden/p/9531940.html