使用 webpack 和 react-router 进行延迟加载和代码拆分不加载
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【中文标题】使用 webpack 和 react-router 进行延迟加载和代码拆分不加载【英文标题】:Using webpack and react-router for lazyloading and code-splitting not loading 【发布时间】:2016-04-27 19:32:45 【问题描述】:我正在努力将我的 react v0.14
+ redux v3.0
+ react-router v1.0
代码库从客户端渲染移动到服务器端渲染,使用 webpack v1.12
捆绑和代码拆分成块以加载路由和组件-需求。
我正在关注并基于https://github.com/rackt/example-react-router-server-rendering-lazy-routes 进行设置,因为我认为它提供了简单性和强大的实用性。昨天一整天,我一直在努力转向服务器端渲染,但遇到了一些我无法解决的问题,我不确定它们是否是因为 webpack
设置不正确,如果我在服务器/客户端或路由配置上的 react-router
做错了什么,或者我在设置 redux
时做错了导致这些问题。
我遇到以下问题:
-
我可以加载初始页面,一切正常,但没有其他路由加载,给了我GET http://localhost:3000/profile 404 (Not Found)
索引/主页 javascript 有效,但所有资产 (css) 都呈现为
text/javascript
,因此样式不会显示,除非它们是内联的。
webpack.config.js
var fs = require('fs')
var path = require('path')
var webpack = require('webpack')
module.exports =
devtool: 'source-map',
entry: './client/client.jsx',
output:
path: __dirname + '/__build__',
filename: '[name].js',
chunkFilename: '[id].chunk.js',
publicPath: '/__build__/'
,
module:
loaders: [
test: /\.jsx?$/,
exclude: /(node_modules|bower_components)/,
loader: 'babel-loader'
]
,
plugins: [
new webpack.optimize.OccurenceOrderPlugin(),
new webpack.optimize.DedupePlugin(),
new webpack.optimize.UglifyJsPlugin(
compressor: warnings: false ,
),
new webpack.DefinePlugin(
'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'development')
)
]
server.js
import http from 'http';
import React from 'react';
import renderToString from 'react-dom/server';
import match, RoutingContext from 'react-router';
import Provider from 'react-redux';
import configureStore from './../common/store/store.js';
import fs from 'fs';
import createPage, write, writeError, writeNotFound, redirect from './server-utils.js';
import routes from './../common/routes/rootRoutes.js';
const PORT = process.env.PORT || 3000;
var store = configureStore();
const initialState = store.getState();
function renderApp(props, res)
var markup = renderToString(
<Provider store=store>
<RoutingContext ...props/>
</Provider>
);
var html = createPage(markup, initialState);
write(html, 'text/html', res);
http.createServer((req, res) =>
if (req.url === '/favicon.ico')
write('haha', 'text/plain', res);
// serve JavaScript assets
else if (/__build__/.test(req.url))
fs.readFile(`.$req.url`, (err, data) =>
write(data, 'text/javascript', res);
)
// handle all other urls with React Router
else
match( routes, location: req.url , (error, redirectLocation, renderProps) =>
if (error)
writeError('ERROR!', res);
else if (redirectLocation)
redirect(redirectLocation, res);
else if (renderProps)
renderApp(renderProps, res);
else
writeNotFound(res);
);
).listen(PORT)
console.log(`listening on port $PORT`)
服务器工具
与我在example-react-router-server-rendering-lazy-routes
上面发布的repo 相同,只需导航到repo 中的/modules/utils/server-utils.js
。唯一的区别是createPage
函数:
export function createPage(html, initialState)
return( `
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="./../bower_components/Ionicons/css/ionicons.min.css">
<link rel="stylesheet" href="./../dist/main.css">
<title>Sell Your Soles</title>
</head>
<body>
<div id="app">$html</div>
<script>window.__INITIAL_STATE__ = $JSON.stringify(initialState);</script>
<script src="/__build__/main.js"></script>
</body>
</html>
`);
rootRoute.js
// polyfill webpack require.ensure
if (typeof require.ensure !== 'function') require.ensure = (d, c) => c(require)
import App from '../components/App.jsx'
import Landing from '../components/Landing/Landing.jsx'
export default
path: '/',
component: App,
getChildRoutes(location, cb)
require.ensure([], (require) =>
cb(null, [
require('./UserProfile/UserProfileRoute.js'),
require('./UserHome/UserHomeRoute.js'),
require('./SneakerPage/SneakerPageRoute.js'),
require('./Reviews/ReviewsRoute.js'),
require('./Listings/ListingsRoute.js'),
require('./Events/EventsRoute.js')
])
)
,
indexRoute:
component: Landing
userProfileRoute.js
import UserProfile from '../../components/UserProfile/UserProfile.jsx';
export default
path: 'profile',
component: UserProfile
client.js
import React from 'react';
import match, Router from 'react-router';
import render from 'react-dom';
import createHistory from 'history';
import routes from './../common/routes/rootRoutes.js';
import Provider from 'react-redux';
import configureStore from './../common/store/store.js';
const pathname, search, hash = window.location;
const location = `$pathname$search$hash`;
const initialState = window.__INITIAL_STATE__;
const store = configureStore(initialState);
// calling `match` is simply for side effects of
// loading route/component code for the initial location
match( routes, location , () =>
render(
<Provider store=store>
<Router routes=routes history=createHistory() />
</Provider>,
document.getElementById('app')
);
);
【问题讨论】:
【参考方案1】:我在不和谐方面帮助了你,但我想我也会在这里发布答案。
如果您使用 babel6(而不是 babel5)并在组件中使用导出默认值,那么您需要将路由更新为以下内容:
getChildRoutes(location, cb)
require.ensure([], (require) =>
cb(null, [
require('./UserProfile/UserProfileRoute.js').default,
require('./UserHome/UserHomeRoute.js').default,
require('./SneakerPage/SneakerPageRoute.js').default,
require('./Reviews/ReviewsRoute.js').default,
require('./Listings/ListingsRoute.js').default,
require('./Events/EventsRoute.js').default
])
)
有关详细信息,请参阅此 SO 讨论:Babel 6 changes how it exports default
【讨论】:
如果你不想在每次需要时都写.default
,你也可以添加add-module-exports babel-plugin。【参考方案2】:
如果你碰巧升级到 Webpack 2(+ tree shaking),你会使用 System.import
而不是 requires,这非常有用。
方法如下:
import App from 'containers/App';
function errorLoading(err)
console.error('Dynamic page loading failed', err);
function loadRoute(cb)
return (module) => cb(null, module.default);
export default
component: App,
childRoutes: [
path: '/',
getComponent(location, cb)
System.import('pages/Home')
.then(loadRoute(cb))
.catch(errorLoading);
,
path: 'blog',
getComponent(location, cb)
System.import('pages/Blog')
.then(loadRoute(cb))
.catch(errorLoading);
]
;
您可以在这篇博文中获得完整指南:Automatic Code Splitting for React Router
【讨论】:
你会知道 webpack 2 什么时候发布吗?还是仍处于测试阶段? @kennetpostigo 目前仍处于测试阶段。团队正在为完成发布付出巨大努力,但我无法透露时间表 你好。我想做服务器渲染?当我尝试使用System.import
实现此功能时,我收到System.import is not a function
错误
您的服务器端不知道如何解析 System.import。目前最简单的方法是在服务器端使用 react.ensure。
System.import()
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