我正在使用HTML5,JavaScript和React创建网站。 我正在使用Google Chrome Lighthouse来检查首次加载网站的效果。
这是Lighthouse Runtime环境:
经过多次迭代和修复,这些是我到目前为止在灯塔上的分数:
最佳实践不是100,因为:
我的主要问题是性能指标。 我有一个超过3.3秒的白色空白屏幕,并在8.3秒后完全显示! 第一个有意义的油漆是5,750毫秒,第一个互动是6,720毫米(相同的一致性互动) 感知速度指数是4,228(得分64) 估计输入延迟为16毫秒(得分100)
这是我到目前为止所做的/尝试过:
这是我的webpack.config.js
const webpack = require('webpack');
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ChunkManifestPlugin = require('chunk-manifest-webpack-plugin');
const WebpackChunkHash = require('webpack-chunk-hash');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
//var SWPrecacheWebpackPlugin = require('sw-precache-webpack-plugin');
const OfflinePlugin = require('offline-plugin');
// To handle the regeneratorRuntime exception
require('babel-polyfill');
require('file-loader');
require('css-loader');
require('style-loader');
require('html-webpack-template');
/* Shared Dev & Production */
const config = {
context: path.resolve(__dirname, 'src'),
entry: {
index: [
// To handle the regeneratorRuntime exception
'babel-polyfill',
'./index.js'
],
vendor: ['offline-plugin/runtime', 'react', 'react-dom', 'react-router', 'react-redux', 'history', 'react-router-dom', 'redux', 'react-router-redux', 'redux-form', 'lodash'],
},
module: {
rules: [
{
test: /\.js$/,
use: 'babel-loader',
exclude: /node_modules/,
},
{
test: /\.(ico|jpg|png|gif|eot|otf|jp2|jxr|webp|svg|ttf|woff|woff2)(\?.*)?$/,
exclude: /\/favicon.ico$/,
use: [
{
loader: 'file-loader',
query: {
name: '[path][name][hash].[ext]',
publicPath: '/'
}
}
]
},
{
test: /\.css$/,
include: path.join(__dirname, 'src/style'),
use: [
'style-loader',
{
loader: 'css-loader',
options: {
minimize: true
}
}
]
},
{
test: /\.(ico)(\?.*)?$/,
exclude: /node_modules/,
use: {
loader: 'file-loader',
options: { name: '[name].[ext]' },
},
},
{
test: /\.xml/,
use: {
loader: 'file-loader',
options: { name: '[name].[ext]' },
},
},
],
},
output: {
path: path.resolve(__dirname, 'dist'),
filename: '[name].bundle.js',
publicPath: '/',
},
resolve: {
extensions: ['.js'],
modules: [path.resolve(__dirname, 'src'), 'node_modules'],
},
plugins: [
// New moment.js optimization
new webpack.ContextReplacementPlugin(/moment[\/\\]locale$/, /en/),
new webpack.optimize.CommonsChunkPlugin({
name: 'vendor',
minChunks: 2
}),
new webpack.optimize.ModuleConcatenationPlugin(),
new HtmlWebpackPlugin({
appMountId: 'app-root',
inlineManifestWebpackName: 'webpackManifest',
template: 'templateIndex.html',
title: 'Our Site',
}),
new OfflinePlugin({
AppCache: false,
ServiceWorker: { events: true },
}),
new BundleAnalyzerPlugin({analyzerMode: 'static'}),
],
devServer: {
historyApiFallback: true,
},
};
//if (process.env.NODE_ENV === 'production') {
config.output.filename = '[name].[chunkhash].js';
config.plugins = [
...config.plugins,
new webpack.HashedModuleIdsPlugin(),
new WebpackChunkHash(),
/*new ChunkManifestPlugin({
filename: 'chunk-manifest.json',
manifestVariable: 'webpackManifest',
inlineManifest: true,
}),*/
];
//}
module.exports = config;
我的.babelrc
{
"presets": [
[
"env",
{ "modules": false }
],
"react",
"stage-0",
"stage-2"
],
"plugins": [ "syntax-dynamic-import", "transform-react-jsx", "transform-decorators-legacy" ]
}
我的index.js
import React from 'react';
import { render } from 'react-dom';
import { BrowserRouter } from "react-router-dom";
import {Redirect, Route, Switch, withRouter} from 'react-router';
import { Provider } from 'react-redux';
import Async from 'react-code-splitting';
const TopBar = () => (<Async load={import('./containers/TopBar/TopBarAsync')} />);
const NavBar = () => (<Async load={import('./containers/NavBar/NavBarAsync')} />);
const BottomBar = () => (<Async load={import('./containers/BottomBar/BottomBarAsync')} />);
const UserHelpers = (props) => <Async load={import('./containers/UserHelpers')} componentProps={props} />
const Main = () => (<Async load={import('./containers/Main')} />);
const Blog = () => (<Async load={import('./containers/Blog')} />);
const PublicPage = () => (<Async load={import('./containers/PublicPage')} />);
import configureStore from './store/store';
const store = configureStore();
import './styles/font-awesome.min.css';
import './styles/app.css';
import './styles/TeamBrowser.css';
let googleTracking = null;
if(process.env.NODE_ENV==='production') {
// https://web-design-weekly.com/2016/07/08/adding-google-analytics-react-application/
ReactGA.initialize([my key here]);
googleTracking = function fireTracking() {
let page=window.location.pathname+window.location.search;
ReactGA.set({ page: page });
ReactGA.pageview(page);
}
const runtime=require('offline-plugin/runtime');
runtime.install({
onUpdateReady() {
runtime.applyUpdate();
},
onUpdated() {
window.location.reload();
},
});
}
render((
<Provider
store={store}>
<BrowserRouter
onUpdate={googleTracking}>
<div className="body">
<header>
<TopBar/>
<NavBar />
</header>
<main>
<Switch>
<Route path="/" exact component={Main} />
<Route path="/main" component={Main} />
<Route path="/Feed" component={Blog} />
<Route path="/Blog" component={Blog} />
<Route path="/:id" component={PublicPage} />
<Redirect to="/" />
</Switch>
</main>
<footer
className="footer">
<BottomBar />
</footer>
<UserHelpers />
</div>
</BrowserRouter>
</Provider>),
document.getElementById('app'));
目前我对如何提高加载速度以获得更好的灯塔得分没有想法。 任何人都可以发现任何我不知道的事情吗?
对我来说,看起来chunk-manifest-webpack-plugin没有正常工作,因为它没有提取所有常用模块。 第二,索引。[hash] .js bundle包含它不应该的文件(例如:utils.js,'actions'文件夹下的文件,......这些是我自己的文件,但我的索引中没有引用它们.js为什么要把它们放在那里?