webpack 热更新(实施同步刷新)

2021-12-08 14:34:54 浏览数 (1)

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
代码语言:javascript复制
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)
代码语言:javascript复制
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:
代码语言:javascript复制
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:workspaceHBuilder React_ProbjectwebPack-demo1webpckapp)

执行这两个命令:

代码语言:javascript复制
$ 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

代码语言:javascript复制
  "scripts": {
    "start": "node dev-serve.js"
  },

最终package.json文件如下:

代码语言:javascript复制
{
  "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)

代码语言:javascript复制
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-loader'
        }, {
            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'],//1.0的配置
            loaders: ['jsx-loader', 'babel-loader'],//2.0   必须加上 loader
        }]
    },
    resolve: {
        //extensions: ['', '.js', '.json'],
        extensions: ['.js', '.json'],//webpack 2.0以上的配置 2017-11-03改
    },
    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

代码语言:javascript复制
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

代码语言:javascript复制
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:

代码语言:javascript复制
(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:

代码语言:javascript复制
(1)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:

代码语言:javascript复制
  1. npm init 自定义创建package.json  
  2. 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:

代码语言:javascript复制
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:

代码语言:javascript复制
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。

代码语言:javascript复制
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:

代码语言:javascript复制
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:

代码语言:javascript复制
"scripts": {  
    "build": "webpack",  
    "dev": "webpack-dev-server --devtool eval --progress --colors --content-base build"  
}  

package.json全部文件附上:

代码语言:javascript复制
{
  "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:

代码语言:javascript复制
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

解决方案二:链接地址

安装完成之后运行命令

1、根目录下执行命令,其中一个:

代码语言:javascript复制
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

ok,完成!


2017-11加

webpack最近更新版在 在这里

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