uglify-es和uglify-js（只压缩js）不依赖webpack

webpack配置里面拆出来单独使用uglify-es和uglify-js

因为别人写的代码会有很多全局的变量，所以不能用webpack打包，webpack打包会把全局的变量变成局部变量。所以我用uglify-es和uglify-js对项目的js进行压缩。

命令行

shell脚本

uglifyjs example.js -c -m -o dist/example.min.js

 http://www.ruanyifeng.com/blog/2016/10/npm_scripts.html

uglify-es

https://github.com/mishoo/UglifyJS2

 配置写在 

config/index.js 文件夹里面
执行的是 node 命令

var UglifyJS = require("uglify-es");
var fs =require("fs");

var code = {
    "file1.js": "function add(first, second) { return first + second; }",
    "file2.js": "console.log(add(1 + 2, 3 + 4));"
};

var options = {
    mangle: {
        toplevel: false, //不修改全局的变量名
    },
    nameCache: {}
};

for(var codeI in code){
    var true_code = code[codeI];
    var result = UglifyJS.minify(true_code, options);
    fs.writeFile('./dist/'+codeI, result.code,  function(err) {
        
    });
}

package.json里面写

"scripts": {
    "test": "echo "Error: no test specified" && exit 1",
    "start": "node config/index.js"
  },

npm run start可以执行压缩并且生成文件

优化输入，自动读取输入文件

var UglifyJS = require("uglify-es");
var fs = require("fs");

var conFig = {
    enterFile: 'files/',
    outFile: './dist'
}


deleteDist();

var code = {}
fs.readdirSync('files').map((file) => {
    console.log(file);
    var content = fs.readFile(conFig.enterFile+file,'utf-8', function (err,data) { 
        code = {};
        code[file] = data;
        Uglify(code)
     });
});

function deleteDist(){
    fs.readdirSync(conFig.outFile).map((file) => {
        fs.unlink(conFig.outFile+`/${file}`,(err) => {
          if (err) {
            console.log(err);
          } else {
            console.log('delete ok');
          }
        });
      });
}

function Uglify(code) {
    var options = {
        mangle: {
            toplevel: true,
        },
        nameCache: {}
    };
    for(var codeI in code){
        var true_code = code[codeI];
        var result = UglifyJS.minify(true_code, options);
        fs.writeFile(conFig.outFile+'/'+codeI, result.code,  function(err) {
    
        });
    }
}