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
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)
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
//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:
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:
$ 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
"scripts": {
"start": "node dev-serve.js"
},
最终package.json文件如下:
{
"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://git@github.com/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-hot-loader": "^0.4.5",
"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)
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$/,
exclude: /^node_modules$/,
loader: ExtractTextPlugin.extract('style', ['css', 'autoprefixer'])
}, {
test: /\.less$/,
exclude: /^node_modules$/,
loader: ExtractTextPlugin.extract('style', ['css', 'autoprefixer', 'less'])
}, {
test: /\.scss$/,
exclude: /^node_modules$/,
loader: ExtractTextPlugin.extract('style', ['css', 'autoprefixer', 'sass'])
}, {
test: /\.(eot|woff|svg|ttf|woff2|gif|appcache)(\?|$)/,
exclude: /^node_modules$/,
loader: 'file-loader?name=[name].[ext]'
}, {
test: /\.(png|jpg|gif)$/,
exclude: /^node_modules$/,
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$/,
exclude: /^node_modules$/,
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
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
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: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:
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:
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:
复制代码 代码如下:
npm install react react-dom react-router react-hot-loader 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。
复制代码 代码如下:
npm install babel-loader 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:
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:
"scripts": {
"build": "webpack",
"dev": "webpack-dev-server --devtool eval --progress --colors --content-base build"
}
package.json全部文件附上:
{
"name": "yubai8",
"version": "1.1.1",
"main": "index.js",
"dependencies": {},
"devDependencies": {
"html-webpack-plugin": "^2.26.0",
"webpack-dev-server": "^1.16.2"
},
"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:
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']
}
}]
},
plugins: [
new HtmlWebpackPlugin({
template: './index.html'
}),
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:
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天达云。