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1.React多页面应用1(webpack开发环境搭建,包括Babel、热更新等) ----2017.12.28
2.React多页面应用2(处理CSS及图片,引入postCSS及图片处理等)----2017.12.29
3.React多页面应用3(webpack性能提升,包括打包性能、提取公共包等)----2017.12.30
4.React多页面应用4(webpack自动化生成多入口页面)----2017.12.31
5.React多页面应用5(webpack生产环境配置,包括压缩js代码,图片转码等)----2018.01.01
6.React多页面应用6(gulp自动化发布到多个环境,生成版本号,打包成zip等)----2018.01.02
7.React多页面应用7(引入eslint代码检查)----2018.01.03
开发环境:Windows 8,node v8.9.1,npm 5.5.1,WebStorm 2017.2.2
当我们项目页面越来越多,依赖越来越多,打包时间会越来越长,那么我们如优化呢?
1.打包性能问题 (涉及很多因素,我们慢慢来)
引入依赖
npm i -D cache-loader
修改 webpack.dev.conf.js
const webpack =require('webpack');//引入webpack
const opn =require('opn');//打开浏览器
const merge =require('webpack-merge');//webpack配置文件合并
const path =require("path");
const baseWebpackConfig =require("./webpack.base.conf");//基础配置
const webpackFile =require("./webpack.file.conf");//一些路径配置
let config = merge(baseWebpackConfig, {
output: {
path: path.resolve(webpackFile.devDirectory),
filename:'js/[name].js',
chunkFilename:"js/[name]-[id].js",
publicPath:''
},
plugins: [
/*设置开发环境*/
new webpack.DefinePlugin({
'process.env': {
NODE_ENV: JSON.stringify('development'),
}
}),
/*设置热更新*/
new webpack.HotModuleReplacementPlugin(),
],
module: {
rules: [
{
test:/\.(js|jsx)$/,
use: [
'cache-loader',
'babel-loader',
],
include: [
path.resolve(__dirname, "../../app"),
path.resolve(__dirname, "../../entryBuild")
],
exclude: [
path.resolve(__dirname, "../../node_modules")
],
},
{
test:/\.(css|pcss)$/,
loader:'style-loader?sourceMap!css-loader?sourceMap!postcss-loader?sourceMap',
exclude:/node_modules/
},
{
test:/\.(png|jpg|gif|ttf|eot|woff|woff2|svg|swf)$/,
loader:'file-loader?name=[name].[ext]&outputPath=' +webpackFile.resource +'/'
}
]
},
/*设置api转发*/
devServer: {
host:'0.0.0.0',
port:8080,
hot:true,
inline:true,
contentBase: path.resolve(webpackFile.devDirectory),
historyApiFallback:true,
disableHostCheck:true,
proxy: [
{
context: ['/api/**', '/u/**'],
target:'http://192.168.12.100:8080/',
secure:false
}
],
/*打开浏览器 并打开本项目网址*/
after() {
opn('http://localhost:' +this.port);
}
}
});
module.exports = config;
添加了如下代码
use: [
'cache-loader',
'babel-loader',
],
我们看下效果
没有引入 cache-loader
打包时间
引入 cache-loader
打包时间
减少了3秒,再页面相当多的时候,优化是很明显的!
2.提取公共包
首先我们看下 首页 和 商城页 相同部分很不同部分
几乎一模一样,好! 我们提取公共部分,放入一个组件中
我们在 app-> component -> common 目录下 新建 Seconds.jsx 公共组件
import Reactfrom 'react';
class Secondsextends React.Component {
constructor(props) {
super(props);
this.state = {seconds:0};
}
tick() {
this.setState(prevState => ({
seconds: prevState.seconds +1
}));
}
componentDidMount() {
this.interval =setInterval(() =>this.tick(), 1000);
}
componentWillUnmount() {
clearInterval(this.interval);
}
render() {
return (
这是{this.props.title}
Seconds: {this.state.seconds}
);
}
}
export default Seconds;
改造 首页
import Reactfrom 'react';
import '../../public/css/index.pcss'
import Secondsfrom '../common/Seconds'
const Index = () =>
;
export default Index;
改造商城页
import Reactfrom 'react';
import '../../public/css/shop.pcss'
import Secondsfrom '../common/Seconds'
const Index = () =>
;
export default Index;
npm run dev 运行看下 是否正常
一切正常
3.开始提取
目标是:
react react-dom 我们打包成 vendor.js 因为他们是第三方部,几乎不会变,除非你升级
组件的公共部分 我们打包成 common.js
组件独立的业务代码我们打包在对应的js文件中 如 index.js 或 shop.js
改造
config -> webpack -> webpack.base.conf.js
const json =require('../../package.json');//引进package.json
const newEntry = {
'index':'./entryBuild/index.js',
'shop':'./entryBuild/shop.js',
};
newEntry.vendor = Object.keys(json.dependencies); //把 package.json dependencies字段的值放进 vendor中
let config = {
entry: newEntry,
resolve: {
extensions: [".js", ".json", ".jsx", ".css", ".pcss"],
}
};
module.exports = config;
改造
config -> webpack -> webpack.dev.conf.js
const webpack =require('webpack');//引入webpack
const opn =require('opn');//打开浏览器
const merge =require('webpack-merge');//webpack配置文件合并
const path =require("path");
const baseWebpackConfig =require("./webpack.base.conf");//基础配置
const webpackFile =require("./webpack.file.conf");//一些路径配置
let config = merge(baseWebpackConfig, {
output: {
path: path.resolve(webpackFile.devDirectory),
filename:'js/[name].js',
chunkFilename:"js/[name]-[id].js",
publicPath:''
},
plugins: [
/*设置开发环境*/
new webpack.DefinePlugin({
'process.env': {
NODE_ENV: JSON.stringify('development'),
}
}),
/*设置热更新*/
new webpack.HotModuleReplacementPlugin(),
/* common 业务公共代码，vendor引入第三方 */
new webpack.optimize.CommonsChunkPlugin({
name: ["common", "vendor"],
}),
/* 防止 vendor hash 变化 */
// 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',
chunks: ['vendor']
}),
],
module: {
rules: [
{
test:/\.(js|jsx)$/,
use: [
'cache-loader',
'babel-loader',
],
include: [
path.resolve(__dirname, "../../app"),
path.resolve(__dirname, "../../entryBuild")
],
exclude: [
path.resolve(__dirname, "../../node_modules")
],
},
{
test:/\.(css|pcss)$/,
loader:'style-loader?sourceMap!css-loader?sourceMap!postcss-loader?sourceMap',
exclude:/node_modules/
},
{
test:/\.(png|jpg|gif|ttf|eot|woff|woff2|svg|swf)$/,
loader:'file-loader?name=[name].[ext]&outputPath=' +webpackFile.resource +'/'
}
]
},
/*设置api转发*/
devServer: {
host:'0.0.0.0',
port:8080,
hot:true,
inline:true,
contentBase: path.resolve(webpackFile.devDirectory),
historyApiFallback:true,
disableHostCheck:true,
proxy: [
{
context: ['/api/**', '/u/**'],
target:'http://192.168.12.100:8080/',
secure:false
}
],
/*打开浏览器 并打开本项目网址*/
after() {
opn('http://localhost:' +this.port);
}
}
});
module.exports = config;
添加了如下代码
/*设置热更新*/
new webpack.HotModuleReplacementPlugin(),
/* common 业务公共代码，vendor引入第三方 */
new webpack.optimize.CommonsChunkPlugin({
name: ["common", "vendor"],
}),
/* 防止 vendor hash 变化 */
// 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',
chunks: ['vendor']
}),
改造 index.html
react1
添加了如下代码
注:顺序不能变
改造 shop.html
react1
注:顺序不能变
发现没有 其实 index.html 和 shop.html 两个页面 很像 很像 是不是? 我们会再后面自动化生成页面中 来解决这个问题,就不用手动去新建了!
npm run dev 看下效果
没提取之前
提取之后
一切正常
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