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  • 单页面多页面的理解,以及如何搭建多页面应用



    这样对比的话,单页面的优势确实很大,但当我自己去打开某宝,某东的移动端页面时,确实它们都是多页面应用。为什么?我能想到的就几点:
    1.单页面使用的技术对低版本的浏览器不友好,大公司还得兼顾使用低版本浏览器的用户啊

    2.功能模块开发来说,比如说单页面的业务公用组件,有时候你都不知道分给谁开发

    3.seo优化吧(PS:既然是大应用应该很多人都知道,为什么还要做搜索引擎优化)

    公司开发移动端使用的技术是vue,其实老大在要求使用多页面开发的时候,已经搭了一个vue多页面的脚手架供给我们去使用,但是我去看了看源码的时候写得很一般,所以决定自己重新去写过。

    思路:

    由于vue-cli已经写好了单页面的webpack文件,不去改动之前是它默认的一个页面引用打包的资源。既然是多页面,那么把webpack入口文件改成多个就好了啊。未改动时的webpack.base.conf.js(这个JS的功能主要在于全局配置,比如入口文件,出口文件,解析规则等)

    // 把箭头部分的入口文件改为以下
     entry: {
       'index': '..../main.js'  // 注意省略号是实际开发时的项目路径
       'product': '..../main.js'    
     }
    

    但是这样做效率得多低下,每增加一个新页面就要手动去添加新的入口,所以这里把入口文件封装为一个函数:

    /**
     * 获取多页面入口文件
     * @globPath 文件路径
     */
    const glob = require('glob')
    function getEntries(globPath)  {
      const entries = glob.sync(globPath).reduce((result, entry) => {
        const moduleName = path.basename(path.dirname(entry)) // 获取模块名称
        result[moduleName] = entry
        return result
      }, {})
      return entries
    }
    

    注意在使用nodejs的glob模块之前,记得先下载依赖

    测试一下这个函数

    然后把webpack.base.config.js改为如下:

    'use strict'
    const path = require('path')
    const utils = require('./utils')
    const config = require('../config')
    const vueLoaderConfig = require('./vue-loader.conf')
    
    function resolve (dir) {
      return path.join(__dirname, '..', dir)
    }
    
    const glob = require('glob')
    function getEntries (globPath){
      const entries = glob.sync(globPath).reduce((result, entry) => {
        const moduleName = path.basename(path.dirname(entry)) // 获取模块名称
        result[moduleName] = entry
        return result
      }, {})
      return entries
    }
    
    const entries = getEntries('./src/modules/**/*.js')
    
    module.exports = {
      context: path.resolve(__dirname, '../'),
      entry: entries,   // 改动部分
      output: {
        path: config.build.assetsRoot,
        filename: '[name].js',
        publicPath: process.env.NODE_ENV === 'production'
          ? config.build.assetsPublicPath
          : config.dev.assetsPublicPath
      },
      resolve: {
        extensions: ['.js', '.vue', '.json'],
        alias: {
          'vue$': 'vue/dist/vue.esm.js',
          '@': resolve('src'),
        }
      },
      module: {
        rules: [
          {
            test: /.vue$/,
            loader: 'vue-loader',
            options: vueLoaderConfig
          },
          {
            test: /.js$/,
            loader: 'babel-loader',
            include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]
          },
          {
            test: /.(png|jpe?g|gif|svg)(?.*)?$/,
            loader: 'url-loader',
            options: {
              limit: 10000,
              name: utils.assetsPath('img/[name].[hash:7].[ext]')
            }
          },
          {
            test: /.(mp4|webm|ogg|mp3|wav|flac|aac)(?.*)?$/,
            loader: 'url-loader',
            options: {
              limit: 10000,
              name: utils.assetsPath('media/[name].[hash:7].[ext]')
            }
          },
          {
            test: /.(woff2?|eot|ttf|otf)(?.*)?$/,
            loader: 'url-loader',
            options: {
              limit: 10000,
              name: utils.assetsPath('fonts/[name].[hash:7].[ext]')
            }
          }
        ]
      },
      node: {
        // prevent webpack from injecting useless setImmediate polyfill because Vue
        // source contains it (although only uses it if it's native).
        setImmediate: false,
        // prevent webpack from injecting mocks to Node native modules
        // that does not make sense for the client
        dgram: 'empty',
        fs: 'empty',
        net: 'empty',
        tls: 'empty',
        child_process: 'empty'
      }
    }
    

    注意我的多页面目录:

    公共配置搞完之后是打包文件:webpack.prod.conf.js,打包文件的修改主要是输出文件的配置,因为要对应入口文件的文件夹,还有就是一个页面对应一个htmlwebpackplugin配置,这个配置是加在文件的plugins里面的,按照上面的消除手动加入配置的思路这里也加入htmlwebpackplugin的配置函数

    /**
     * 页面打包
     * @entries 打包文件
     * @config 参数配置
     * @module 使用的主体
     */
    const HtmlWebpackPlugin = require('html-webpack-plugin')
    function pack (entries, module) {
      for (const path in entries) {
        const conf = {
          filename: `modules/${path}/index.html`,
          template: entries[path],   // 模板路径
          inject: true,
          chunks: ['manifest', 'vendor', path]   // 必须先引入公共依赖
        }
        module.plugins.push(new HtmlWebpackPlugin(conf))
      }
    }
    

    最终打包文件改为如下

    'use strict'
    const path = require('path')
    const utils = require('./utils')
    const webpack = require('webpack')
    const config = require('../config')
    const merge = require('webpack-merge')
    const baseWebpackConfig = require('./webpack.base.conf')
    const CopyWebpackPlugin = require('copy-webpack-plugin')
    const HtmlWebpackPlugin = require('html-webpack-plugin')
    const ExtractTextPlugin = require('extract-text-webpack-plugin')
    const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')
    const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
    
    const env = require('../config/prod.env')
    
    
    const glob = require('glob')
    function getEntries (globPath){
      const entries = glob.sync(globPath).reduce((result, entry) => {
        const moduleName = path.basename(path.dirname(entry)) // 获取模块名称
        result[moduleName] = entry
        return result
      }, {})
      return entries
    }
    
    const entries = getEntries('./src/modules/**/*.html')   // 获取多页面所有入口文件
    
    const webpackConfig = merge(baseWebpackConfig, {
      module: {
        rules: utils.styleLoaders({
          sourceMap: config.build.productionSourceMap,
          extract: true,
          usePostCSS: true
        })
      },
      devtool: config.build.productionSourceMap ? config.build.devtool : false,
      output: {
        path: config.build.assetsRoot,
        filename: 'modules/[name]/[name].[chunkhash].js',
        // publicPath: '/' // 改为相对路径
        // chunkFilename: utils.assetsPath('js/[id].[chunkhash].js')
      },
      plugins: [
        // http://vuejs.github.io/vue-loader/en/workflow/production.html
        new webpack.DefinePlugin({
          'process.env': env
        }),
        new UglifyJsPlugin({
          uglifyOptions: {
            compress: {
              warnings: false
            }
          },
          sourceMap: config.build.productionSourceMap,
          parallel: true
        }),
        // extract css into its own file
        new ExtractTextPlugin({
          filename: utils.assetsPath('css/[name].[contenthash].css'),
          // Setting the following option to `false` will not extract CSS from codesplit chunks.
          // Their CSS will instead be inserted dynamically with style-loader when the codesplit chunk has been loaded by webpack.
          // It's currently set to `true` because we are seeing that sourcemaps are included in the codesplit bundle as well when it's `false`, 
          // increasing file size: https://github.com/vuejs-templates/webpack/issues/1110
          allChunks: true,
        }),
        // Compress extracted CSS. We are using this plugin so that possible
        // duplicated CSS from different components can be deduped.
        new OptimizeCSSPlugin({
          cssProcessorOptions: config.build.productionSourceMap
            ? { safe: true, map: { inline: false } }
            : { safe: true }
        }),
        // generate dist index.html with correct asset hash for caching.
        // you can customize output by editing /index.html
        // see https://github.com/ampedandwired/html-webpack-plugin
        // keep module.id stable when vendor modules does not change
        new webpack.HashedModuleIdsPlugin(),
        // enable scope hoisting
        new webpack.optimize.ModuleConcatenationPlugin(),
        // split vendor js into its own file
        new webpack.optimize.CommonsChunkPlugin({
          name: 'vendor',
          minChunks (module) {
            // any required modules inside node_modules are extracted to vendor
            return (
              module.resource &&
              /.js$/.test(module.resource) &&
              module.resource.indexOf(
                path.join(__dirname, '../node_modules')
              ) === 0
            )
          }
        }),
        // extract webpack runtime and module manifest to its own file in order to
        // prevent vendor hash from being updated whenever app bundle is updated
        new webpack.optimize.CommonsChunkPlugin({
          name: 'manifest',
          minChunks: Infinity
        }),
        // This instance extracts shared chunks from code splitted chunks and bundles them
        // in a separate chunk, similar to the vendor chunk
        // see: https://webpack.js.org/plugins/commons-chunk-plugin/#extra-async-commons-chunk
        new webpack.optimize.CommonsChunkPlugin({
          name: 'app',
          async: 'vendor-async',
          children: true,
          minChunks: 3
        }),
    
        // copy custom static assets
        new CopyWebpackPlugin([
          {
            from: path.resolve(__dirname, '../static'),
            to: config.build.assetsSubDirectory,
            ignore: ['.*']
          }
        ])
      ]
    })
    
    if (config.build.productionGzip) {
      const CompressionWebpackPlugin = require('compression-webpack-plugin')
    
      webpackConfig.plugins.push(
        new CompressionWebpackPlugin({
          asset: '[path].gz[query]',
          algorithm: 'gzip',
          test: new RegExp(
            '\.(' +
            config.build.productionGzipExtensions.join('|') +
            ')$'
          ),
          threshold: 10240,
          minRatio: 0.8
        })
      )
    }
    
    if (config.build.bundleAnalyzerReport) {
      const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
      webpackConfig.plugins.push(new BundleAnalyzerPlugin())
    }
    
    
    function pack (entries, module) {
      for (const path in entries) {
        const conf = {
          filename: `modules/${path}/index.html`,
          template: entries[path],   // 模板路径
          inject: true,
          chunks: ['manifest', 'vendor', path]   // 必须先引入公共依赖
        }
        module.plugins.push(new HtmlWebpackPlugin(conf))
      }
    }
    
    pack(entries, webpackConfig)
    module.exports = webpackConfig
    

    然后启动npm run build尝试打包文件

    OK,多页面的打包完成

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  • 原文地址:https://www.cnblogs.com/yangAL/p/10616604.html
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