js 压缩

　　<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>

$(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() {

            }
        })
    })
})

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 = null

app.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});
    })
}