javascript - vue webpack expands abnormally after packaging

Question

I made a demo using Vue. The entire site is just one page. The code is only 300 lines. This is the introduction in main.js. The following is the packaged size. Why is it so big? ? ? Just one page to solve! Although the introduced packages are so big, element still only introduces some components. Are there any optimization methods?

ringa_lee · Answer

vue vue-router vuex element
This size is quite normal

ringa_lee · Answer

You have to include the modules imported from node_modules, otherwise these things will appear out of thin air. .
You didn’t include element-ui, vue, and axios

为情所困 · Answer

When you package, all the packages you depend on will be compressed. If you don’t want the vendor to be so big, you can introduce CDN step by step

Option 1: The externals option is what I said about introducing CDN. It will be much better to introduce it through distribution.

// webpack.prod.config.js
// 多余代码省略
module.exports = {
    externals: {
        'vue': 'window.Vue',
        'vuex': 'window.Vuex',
        'vue-router': 'window.VueRouter'
        ...
    }
}

// 配置externals之后，webpack不会把配置项中的代码打包进去，别忘了需要在外部引入cdn上的js文件
// html

    
    ......

Option 2: webpack.DLLplugin

webpack.dll.config.js:

// webpack.dll.config.js

// 需要打包到一起的js文件
const vendors = [
    'vue',
    'vuex',
    'vue-router',
    'axios',
    'moment',
    'vue-echarts'
];

module.exports = {
    // 也可以设置多个入口，多个vendor，就可以生成多个bundle
    entry: {
        vendor: vendors
    },

    // 输出文件的名称和路径
    output: {
        filename: '[name].bundle.js',
        path: path.join(__dirname, '..', 'static'),
        library: '[name]_[chunkhash]',
    },

    plugins: [
        // 这时候打包需要设置环境为production，因为像vue之类在
        // dev环境下会比prod环境多一些信息，在生产环境如果打包的是dev代码，
        // vue也会给出警告
        new webpack.DefinePlugin({
            'process.env': {
                NODE_ENV: '"production"'
            }
        }),
        new webpack.DllPlugin({
            path: path.join(__dirname, '..', 'static', '[name]-manifest.json'),
            name: '[name]_[chunkhash]',
            context: __dirname
        }),
        
        // 压缩
        new webpack.optimize.UglifyJsPlugin({
            compress: {
                warnings: false
            },
            sourceMap: true
        }),

        new webpack.LoaderOptionsPlugin({
            minimize: true
        }),
        new webpack.optimize.OccurrenceOrderPlugin()
    ]
}

I haven’t researched the second one - -