webpack实现热更新实施同步刷新

本文介绍了webpack实现热更新（实施同步刷新），分享给大家，希望对大家有帮助。

解决方案一：

实现热更新，首先，安装一系列的node命令，如果嫌麻烦，你可以直接看解决方案二，相对来说比较简单。

1、webpack命令安装

rush:bash;"> npm install webpack -g

npm init

npm init -yes //可以创建默认的package.json

npm install webpack --save-dev

npm install path fs html-webpack-plugin extract-text-webpack-plugin autoprefixer webpack-dev-server --save-dev

npm install css-loader style-loader --save-dev//样式文件，我们需要两种loader，css-loader 和 style－loader，css-loader会遍历css文件，找到所有的url(...)并且处理。style-loader会把所有的样式插入到你页面的一个style tag中。

webpack 使用命令：（知道有这个东西就行，这里不做过多介绍）

rush:js;"> webpack --config XXX.js //使用另一份配置文件（比如webpack.config2.js）来打包

webpack --watch //监听变动并自动打包

webpack -p//压缩混淆脚本，这个非常非常重要！

webpack -d//生成map映射文件，告知哪些模块被最终打包到哪里了

其中的 -p 是很重要的参数，曾经一个未压缩的 700kb 的文件，压缩后直接降到 180kb （主要是样式这块一句就独占一行脚本，导致未压缩脚本变得很大） 。

2、webpack 支持es6转码安装

rush:js;"> //安装转码规则 npm install babel-core babel-loader babel-preset-es2015 babel-preset-React babel-preset-stage-0 –save-dev

3、webpack + es6 + react 安装命令：

rush:js;"> npm install react react-dom react-router react-hot-loader css-loader jsx-loader --save-dev

//react-hot-loader 是一款非常好用的 React 热插拔的加载插件，通过它可以实现修改-运行同步的效果，配合 webpack-dev-server 使用更佳！

附注：

css加载不出来的时候或者报错的时候（ERROR Module not found: Error: Cannot resolve module ‘style' in D:\workspace\HBuilder React_Probject\webPack-demo1\webpck\app）

执行这两个命令：

rush:js;"> $ npm i style-loader -D $ npm i css-loader -D

只要你按照命令安装，即可实现，接下来我附加上我的实现代码：需要几个文件：

1、package.json文件

在package.json文件中为scripts添加,方便使用命令:

最终package.json文件如下

rush:js;"> "scripts": { "start": "node dev-serve.js" },

最终package.json文件如下：

rush:js;"> { "name": "yubai","description": "Utility components for react js","version": "1.1.1","keywords": [ "react-component","react-utils","react utility" ],"scripts": { "start": "node dev-serve.js" },"src": "src","test": "test","dist": "dist","mainInput": "ReactUtils","mainOutput": "main","dependencies": { "async": "^0.9.0","backbone": "^1.1.2","bootstrap": "^3.2.0","es6-promise": "^1.0.0","flux": "^2.0.1","font-awesome": "^4.2.0","humps": "0.0.1","jquery": "^2.1.1","jquery.ui.widget": "^1.10.3","json5": "^0.2.0","less": "^1.7.5","less-loader": "^0.7.7","lodash": "^2.4.1","moment": "^2.8.3","normalizr": "^0.1.2","q": "^1.0.1","react-hot-loader": "^0.4.5","rimraf": "^2.2.8","routes": "^1.2.0","superagent": "^0.18.2","codemirror": "3.20.0" },"repository": { "type": "git","url": "git+ssh://[e-mail]/sahusoftcom/react-utils.git" },"devDependencies": { "autoprefixer": "^6.6.1","babel-core": "^6.21.0","babel-loader": "^6.2.10","babel-preset-es2015": "^6.18.0","babel-preset-react": "^6.16.0","css-loader": "^0.6.12","extract-text-webpack-plugin": "^1.0.1","fs": "0.0.1-security","gulp": "^3.8.8","gulp-concat": "^2.4.0","gulp-jshint": "^1.8.4","gulp-rename": "^1.2.0","gulp-sass": "^0.7.3","gulp-uglify": "^1.0.1","gulp-util": "^3.0.1","html-webpack-plugin": "^2.26.0","jshint-loader": "~0.6.0","jsx-loader": "^0.11.2","karma": "~0.10.9","karma-chrome-launcher": "~0.1.2","karma-firefox-launcher": "~0.1.3","karma-jasmine": "~0.1.5","karma-phantomjs-launcher": "~0.1.1","karma-script-launcher": "~0.1.0","karma-webpack-plugin": "~1.0.0","path": "^0.12.7","postcss-loader": "^1.2.1","react": "^15.4.2","react-dom": "^15.4.2","react-router": "^3.0.0","style-loader": "^0.6.5","url-loader": "~0.5.4","webpack": "^1.14.0","webpack-dev-server": "^1.16.2" },"bugs": { "url": "https://github.com/sahusoftcom/react-utils/issues" },"homepage": "https://github.com/sahusoftcom/react-utils#readme","main": "app.js","author": "yubai","license": "ISC" }

以上代码请注意这里，标红部位

2、webpack.config.js文件（webpack主文件）

rush:js;"> var webpack = require('webpack'),path = require('path'),fs = require('fs'),HtmlWebpackPlugin = require('html-webpack-plugin'),ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
entry: {
app: ["./app.js"]
},output: { //输出目录
path: dirname + './build__',publicPath: "",filename: 'shared.js',chunkFilename: '[name].[chunkhash:3].min.js',},module: { //在配置文件里添加JSON loader
loaders: [{
test: /.js$/,exclude: /^node_modules$/,loader: 'babel'
},{
test: /.css$/,loader: ExtractTextPlugin.extract('style',['css','autoprefixer'])
},{
test: /.less$/,'autoprefixer','less'])
},{
test: /.scss$/,'sass'])
},{
test: /.(eot|woff|svg|ttf|woff2|gif|appcache)(\?|$)/,loader: 'file-loader?name=[name].[ext]'
},{
test: /.(png|jpg|gif)$/,loader: 'url-loader?limit=8192&name=images/[hash:8].[name].[ext]'
//注意后面那个limit的参数，当你图片大小小于这个限制的时候，会自动启用base64编码图
},{
test: /.jsx$/,loaders: ['jsx','babel']
}]
},resolve: {
extensions: ['','.js','.json']
},postcss: [
require('autoprefixer') //调用autoprefixer插件,加入各个浏览器的前缀
],plugins: [
new HtmlWebpackPlugin({
template: './index.html'
}),new ExtractTextPlugin('[name]-[hash:3].css'),//css随机数
new webpack.HotModuleReplacementPlugin(),//热加载插件
new webpack.DefinePlugin({
'process.env.NODE_ENV': '"development"'
}),new webpack.NoErrorsPlugin()
]
};

3、webpack服务文件：dev-serve.js

rush:js;"> var config = require("./webpack.config.js"); var webpack = require('webpack'); var WebpackDevServer = require('webpack-dev-server');

config.entry.app.unshift("webpack-dev-server/client?http://localhost:8099/");

var compiler = webpack(config);
var server = new WebpackDevServer(compiler,{
publicPath: config.output.publicPath,stats: {
colors: true
}
});
server.listen(8099);

这里注意下内容，

我的app.js是这么配置的，很简单，

app.js文件

rush:js;"> import React from 'react' import { render } from 'react-dom' import { Router,Route,IndexRoute,Link,IndexLink,hashHistory } from 'react-router'

alert("AAA");

安装完成webpack命令之后，

运行 npm start 命令 ，即可实现本地实施同步开发！

接下来就编写你的代码即可！

全部代码在这里：

解决方案二：（推荐使用）

操作步骤：

1、安装完Node之后，为了保证速度，需要使用淘宝镜像，命令如下：

（1）npm config set registry "http://registry.npm.taobao.org"

（2）npm config list 可以查看配置

2.安装完nodejs之后,打开终端,执行命令:

rush:js;"> npm install webpack -g

//-g的意思是安装全局的webpack,但是我们实际的开发中还需要针对单个的项目进行webpack安装,执行命令:

3、使用 npm init 初始化，生成 package.json 文件：执行命令:

npm init 自定义创建package.json npm init -yes 可以创建默认的package.json

现在我们的项目已经创建好了,接下来我们来添加依赖包及插件

（1） 局部安装Webpack,执行命令：

rush:js;"> npm install webpack --save-dev

（2）安装react,–save 命令用于将包添加至 package.json 文件,执行命令：

代码如下:

css-loader jsx-loader html-webpack-plugin --save-dev

（3） 安装babel插件,babel插件是webpack需要的加载器,如果没有这几个加载器我们的jsx语法，和es2015语法就会报错。

代码如下:

babel-core babel-preset-es2015 babel-preset-react babel-preset-stage-0 --save-dev

（4）安装自动刷新热更新服务，安装webpack-dev-server执行命令：

rush:js;"> npm install webpack-dev-server --save-dev

（5）在package.json文件中为scripts添加,方便使用开启服务命令:

rush:js;"> "scripts": { "build": "webpack","dev": "webpack-dev-server --devtool eval --progress --colors --content-base build" }

package.json全部文件附上：

rush:js;"> { "name": "yubai8","main": "index.js","dependencies": {},"devDependencies": { "html-webpack-plugin": "^2.26.0","scripts": { "build": "webpack","dev": "webpack-dev-server --devtool eval --progress --colors --content-base build" },"author": "","license": "ISC","keywords": [],"description": "" }

这里有一点提醒大家，package.json中name不能跟我们的模块和项目文件目录同名！

安装完命令之后，创建webpack的配置文件：webpack.config.js文件

webpack.config.js文件配置如下：

rush:js;"> var path = require('path'),webpack = require('webpack'),HtmlWebpackPlugin = require('html-webpack-plugin'); module.exports = { entry: ['webpack/hot/dev-server',path.resolve(__dirname,'./app.js')],output: { path: path.resolve(__dirname,'./__build__'),filename: 'bundle.js' },devServer: { inline: true,port: 8099 },module: { loaders: [{ test: /\.js?$/,exclude: /(node_modules|bower_components)/,loader: 'babel',query: { presets: ['es2015','react'] }

}]

},new webpack.HotModuleReplacementPlugin()
]
};

上面第五行 ‘./app.js' 是你的js入口文件

安装完成之后运行命令

1、根目录下执行命令,其中一个：

rush:js;"> npm run build 线上目录

npm run dev 开发目录

2.浏览器直接访问:http://localhost:8099/index.html

解决方案二：代码链接

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程之家。