如何减少反应应用的首次加载页面时间？

Question

反应项目包大小过大虽然使用了所有压缩技术，但是加载第一个索引页需要花费太多时间。第一个浏览器下载包js然后加载页面。如何首先加载索引页然后加载其他组件包。以下是webpack.js

  module.exports = {
  devtool: 'source-map',
  context: path.resolve(__dirname, '..'),
  entry: {
    'main': [
      'bootstrap-sass!./src/theme/bootstrap.config.prod.js',
      'font-awesome-webpack!./src/theme/font-awesome.config.prod.js',
      './src/client.js'
    ]
  },
  output: {
    path: assetsPath,
    filename: '[name]-[chunkhash].js',
    chunkFilename: '[name]-[chunkhash].js',
    publicPath: ''
  },
  module: {
    loaders: [
      { test: /\.jsx?$/, exclude: /node_modules/, loaders: [strip.loader('debug'), 'babel']},
      { test: /\.json$/, loader: 'json-loader' },
      { test: /\.css$/, loader: ExtractTextPlugin.extract('style-loader', 'css-loader')},
      { test: /\.less$/, loader: ExtractTextPlugin.extract('style', 'css?modules&importLoaders=2&sourceMap!autoprefixer?browsers=last 2 version!less?outputStyle=expanded&sourceMap=true&sourceMapContents=true') },
      { test: /\.scss$/, loader: ExtractTextPlugin.extract('style', 'css?modules&importLoaders=2&sourceMap!autoprefixer?browsers=last 2 version!sass?outputStyle=expanded&sourceMap=true&sourceMapContents=true') },
      { test: /\.woff(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/font-woff" },
      { test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/font-woff" },
      { test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=application/octet-stream" },
      { test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: "file" },
      { test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: "url?limit=10000&mimetype=image/svg+xml" },
      { test: webpackIsomorphicToolsPlugin.regular_expression('images'), loader: 'url-loader?limit=10240' },
      { test: /\.html$/, loader: 'html-loader' }
    ]
  },
  progress: true,
  resolve: {
    modulesDirectories: [
      'src',
      'node_modules'
    ],
    extensions: ['', '.json', '.js', '.jsx']
  },
 plugins: [
    // css files from the extract-text-plugin loader
    new ExtractTextPlugin('[name]-[chunkhash].css', {allChunks: true}),

    // ignore dev config
    new webpack.IgnorePlugin(/\.\/dev/, /\/config$/),

    // optimizations
    new webpack.optimize.DedupePlugin(),
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false
      }
    }),

    webpackIsomorphicToolsPlugin
  ]

Answer 1

请更喜欢动态的import函数，以便轻松地分割代码而不会发生太大变化。作为一般准则，动态导入所有顶级路径组件。与pre-loaded modules结合使用时，这将是一个非常有效的工具，可以快速有效地分割代码。

执行此操作时，您可以使用任何可用的加载包装库（如react-loadable）在导入实际组件时显示等待组件。

一个例子（https://reacttraining.com/react-router/web/guides/code-splitting）：

import Loadable from 'react-loadable';
import Loading from './Loading';

const LoadableComponent = Loadable({
  loader: () => import(
                  /* webpackPreload: true */ 
                  /* webpackChunkName: "dashboard" */ 
                  './Dashboard'
                ),
  loading: Loading,
})

export default class LoadableDashboard extends React.Component {
  render() {
    return <LoadableComponent />;
  }
}

在上面的示例中，magic-comments用于定义预加载行为和拆分块名称。阅读更多关于这些here。

使用动态导入来分割您的非反应代码，例如商店。

Answer 2

You can follow strategy of code splitting for effective load.

开源库react-loadable为代码分割提供了一个React友好的API，

以下是与此相关的博客的链接： -

https://hackernoon.com/effective-code-splitting-in-react-a-practical-guide-2195359d5d49

希望能帮助到你。