webpack-配置文件的分离

1.在根目录下新建一个文件夹build，在该文件夹下建立三个文件：base.config.js（公共）、prod.config.js（生产）、dev.config.js（开发）
2.在各个文件下添加相关的代码，例如：
base.config.js:

const HtmlWebpackPlugin = require('html-webpack-plugin');
const path = require("path");
const webpack = require("webpack");
const uglifyJsPlugin = require('uglifyjs-webpack-plugin');
module.exports = {
    entry: "./src/main.js", //入口
    output: { //出口
        path: path.resolve(__dirname, "../dist"),
        filename: "bundle.js"
    },
    module: {
        rules: [{
                test: /\.css$/,
                // css-loader值负责将css文件进行加载
                // style-loader负责将样式添加到DOM中
                use: ['style-loader', 'css-loader'],
            },
            {
                test: /\.vue$/,
                use: ['vue-loader']
            },
            {
                test: /\.(png|jpg|gif|jpeg)$/i,
                use: [{
                    loader: 'url-loader',
                    options: {
                        limit: 8192,
                        name: "img/[name].[hash:8].[ext]"
                    },
                }, ],
            },
        ],
    },
    resolve: {
        alias: {
            "vue$": "vue/dist/vue.esm.js"
        }
    },
    plugins: [
        new webpack.BannerPlugin('最终版权归<WRM>所有'),
        new HtmlWebpackPlugin({
            template: "index.html"

        }),
        // new uglifyJsPlugin()
    ],
    // devServer: {
    //     contentBase: './dist', //为哪一个文件夹提供本地服务，默认是根文件夹，这里填写./dist
    //     inline: true //页面实时刷新

    // }
}

prod.config.js:

const uglifyJsPlugin = require('uglifyjs-webpack-plugin');
module.exports = {
    plugins: [
        new uglifyJsPlugin()
    ],
}

dev.config.js:

module.exports = {
    devServer: {
        contentBase: './dist', //为哪一个文件夹提供本地服务，默认是根文件夹，这里填写./dist
        inline: true //页面实时刷新

    }
}

3.将三个文件进行组合（合并）
（1）安装：

1	cnpm install webpack-merge@4.1.5 --save-dev

（2）prod.config.js修改代码为：

const uglifyJsPlugin = require('uglifyjs-webpack-plugin');
const webpackMerge = require('webpack-merge');
const baseConfig = require('./base.config');
module.exports = webpackMerge(baseConfig,{
    plugins: [
        new uglifyJsPlugin()
    ],
})

dev.config,js下修改代码为：

const webpackMerge = require('webpack-merge');
const baseConfig = require('./base.config');
module.exports = webpackMerge(baseConfig, {
    devServer: {
        contentBase: './dist', //为哪一个文件夹提供本地服务，默认是根文件夹，这里填写./dist
        inline: true //页面实时刷新

    }
})