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webpack實現(xiàn)熱更新(實施同步刷新)

發(fā)布時間:2020-09-19 12:38:38 來源:腳本之家 閱讀:418 作者:Rkatsiteli 欄目:web開發(fā)

本文介紹了webpack實現(xiàn)熱更新(實施同步刷新),分享給大家,希望對大家有幫助。

解決方案一:

實現(xiàn)熱更新,首先,安裝一系列的node命令,如果嫌麻煩,你可以直接看解決方案二,相對來說比較簡單。

1、webpack命令安裝

npm install webpack -g 

npm init

npm init -yes //可以創(chuàng)建默認(rèn)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//樣式文件,我們需要兩種loader,css-loader 和 style-loader,css-loader會遍歷css文件,找到所有的url(...)并且處理。style-loader會把所有的樣式插入到你頁面的一個style tag中。

webpack 使用命令:(知道有這個東西就行,這里不做過多介紹)

webpack --config XXX.js //使用另一份配置文件(比如webpack.config2.js)來打包

webpack --watch //監(jiān)聽變動并自動打包

webpack -p//壓縮混淆腳本,這個非常非常重要!

webpack -d//生成map映射文件,告知哪些模塊被最終打包到哪里了

其中的 -p 是很重要的參數(shù),曾經(jīng)一個未壓縮的 700kb 的文件,壓縮后直接降到 180kb (主要是樣式這塊一句就獨占一行腳本,導(dǎo)致未壓縮腳本變得很大) 。

2、webpack 支持es6轉(zhuǎn)碼安裝

//安裝轉(zhuǎn)碼規(guī)則 
npm install babel-core babel-loader babel-preset-es2015 babel-preset-React babel-preset-stage-0 –save-dev

3、webpack + es6 + react 安裝命令:

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 熱插拔的加載插件,通過它可以實現(xiàn)修改-運(yùn)行同步的效果,配合 webpack-dev-server 使用更佳!

附注:

css加載不出來的時候或者報錯的時候(ERROR Module not found: Error: Cannot resolve module ‘style' in D:\workspace\HBuilder React_Probject\webPack-demo1\webpck\app)

執(zhí)行這兩個命令:

$ npm i style-loader -D
$ npm i css-loader -D

只要你按照命令安裝,即可實現(xiàn),接下來我附加上我的實現(xiàn)代碼:需要幾個文件:

1、package.json文件

在package.json文件中為scripts添加,方便使用命令:

最終package.json文件如下

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

最終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"
}

以上代碼請注意這里,標(biāo)紅部位

webpack實現(xiàn)熱更新(實施同步刷新)

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: { //輸出目錄
    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]'
        //注意后面那個limit的參數(shù),當(dāng)你圖片大小小于這個限制的時候,會自動啟用base64編碼圖
    }, {
      test: /\.jsx$/,
      exclude: /^node_modules$/,
      loaders: ['jsx', 'babel']
    }]
  },
  resolve: {
    extensions: ['', '.js', '.json']
  },
  postcss: [
    require('autoprefixer') //調(diào)用autoprefixer插件,加入各個瀏覽器的前綴
  ],
  plugins: [
    new HtmlWebpackPlugin({
      template: './index.html'
    }),
    new ExtractTextPlugin('[name]-[hash:3].css'), //css隨機(jī)數(shù)
    new webpack.HotModuleReplacementPlugin(), //熱加載插件
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': '"development"'
    }),
    new webpack.NoErrorsPlugin()
  ]
};

3、webpack服務(wù)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);

這里注意下內(nèi)容,

webpack實現(xiàn)熱更新(實施同步刷新)

我的app.js是這么配置的,很簡單,

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");

安裝完成webpack命令之后,

運(yùn)行 npm start 命令 ,即可實現(xiàn)本地實施同步開發(fā)!

接下來就編寫你的代碼即可!

全部代碼在這里:在這里

解決方案二:(推薦使用)

操作步驟:

1、安裝完Node之后,為了保證速度,需要使用淘寶鏡像,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.安裝完nodejs之后,打開終端,執(zhí)行命令:

npm install webpack -g 

//-g的意思是安裝全局的webpack,但是我們實際的開發(fā)中還需要針對單個的項目進(jìn)行webpack安裝,執(zhí)行命令:

3、使用 npm init 初始化,生成 package.json 文件:執(zhí)行命令:

npm init 自定義創(chuàng)建package.json  
npm init -yes 可以創(chuàng)建默認(rèn)的package.json  

現(xiàn)在我們的項目已經(jīng)創(chuàng)建好了,接下來我們來添加依賴包及插件

(1) 局部安裝Webpack,執(zhí)行命令:

npm install webpack --save-dev 

(2)安裝react,–save 命令用于將包添加至 package.json 文件,執(zhí)行命令:

復(fù)制代碼 代碼如下:

npm install  react react-dom react-router react-hot-loader css-loader  jsx-loader html-webpack-plugin --save-dev
 

(3) 安裝babel插件,babel插件是webpack需要的加載器,如果沒有這幾個加載器我們的jsx語法,和es2015語法就會報錯。

復(fù)制代碼 代碼如下:

npm install babel-loader babel-core babel-preset-es2015 babel-preset-react babel-preset-stage-0 --save-dev 

(4)安裝自動刷新熱更新服務(wù),安裝webpack-dev-server執(zhí)行命令:

npm install webpack-dev-server --save-dev

(5)在package.json文件中為scripts添加,方便使用開啟服務(wù)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": ""
}

這里有一點提醒大家,package.json中name不能跟我們的模塊和項目文件目錄同名!

安裝完命令之后,創(chuàng)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

安裝完成之后運(yùn)行命令

1、根目錄下執(zhí)行命令,其中一個:

npm run build     線上目錄

npm run dev      開發(fā)目錄

2.瀏覽器直接訪問:http://localhost:8099/index.html

解決方案二:代碼鏈接

以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持億速云。

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