一、建立简单的项目目录
1、创建 manager 根目录(作为项目根目录)
2、执行 npm init,在根目录manager下自动生成 package.json文件
3、npm install webpack --save-dev,在项目中安装 webpack npm包
4、在根目录下 创建 webpack.config.js,所有的配置代码都写在里面
5、在根目录创建 src 目录,包含 html目录 > index.html,css目录 > index.css,js目录 > index.js,images目录 > index...
如图:
二、配置webpack.config.js文件
1、简单配置及使用
module.exports = { entry: { ‘js/index‘: ‘./src/js/index.js‘ }, output: { path: ‘./build‘, filename: ‘[name].js‘ } };
执行构建命令:./node_modules/webpack/bin/webpack.js
ok,生成下图的目录结构了
2、安装,使用html-webpack-plugin插件
上一步我们通过构建,在根目录下生成了 ./build/js/index.js 文件,我们希望 生成 ./build/html/index.html 文件
首先安装一下插件 npm install html-webpack-plugin --save-dev,再来看看我们的配置代码
var HtmlWebpackPlugin = require(‘html-webpack-plugin‘); var plugins = []; plugins.push( new HtmlWebpackPlugin({ template: ‘./src/html/index.html‘, filename: ‘html/index.html‘, inject: ‘body‘, hash: true, // index.js?hash cache: true, // if true (default) try to emit the file only if it was changed. showErrors: true, // if true (default) errors details will be written into the html page. chunks: [‘js/index‘] // filter chunks }) ); module.exports = { entry: { ‘js/index‘: ‘./src/js/index.js‘ }, output: { path: ‘./build‘, filename: ‘[name].js‘ }, plugins: plugins };
执行构建命令:./node_modules/webpack/bin/webpack.js后
打开./build/html/index.html文件,发现html中自动加上了script标签,引用的js路径加上了hash值,是不是感觉很赞
<script type="text/javascript" src="../js/index.js?f5f204be195973d9d81c"></script>
构建后的项目目录如图:
3、配合babel编译器,让我们所写的js代码支持es6语法
babel官网地址:https://babeljs.io/
安装babel编译器
npm install --save-dev babel-loader babel-core
npm install --save-dev babel-preset-es2015
在根目录下创建 .babelrc 配置文件
{ "presets": ["es2015"] }
webpack.config.js配置如下:
var HtmlWebpackPlugin = require(‘html-webpack-plugin‘); var plugins = []; var loaders = [ { test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" }, { test: /\.css$/, loader: "style-loader!css-loader" } ]; plugins.push( new HtmlWebpackPlugin({ template: ‘./src/html/index.html‘, filename: ‘html/index.html‘, inject: ‘body‘, hash: true, // index.js?hash cache: true, // if true (default) try to emit the file only if it was changed. showErrors: true, // if true (default) errors details will be written into the html page. chunks: [‘js/index‘] // filter chunks }) ); module.exports = { entry: { ‘js/index‘: ‘./src/js/index.js‘ }, output: { path: ‘./build‘, filename: ‘[name].js‘ }, module: { loaders: loaders }, plugins: plugins };
准备好了,我们在 ./src/js/index.js文件中写入:
function testEs6(a, ...args) { console.log(args); // [2,3,4] } testEs6(1,2,3,4); console.log(Set); console.log(Map); new Promise(function(resolve, reject) {});
执行构建命令:./node_modules/webpack/bin/webpack.js,OK,编译成功了,并没有报错,这意味着你可以在你的项目中使用es6了
4、css文件可以作为模块在js中被引入
npm install css-loader --save-dev
npm install style-loader --save-dev
在webpack.config.js文件中配置
var loaders = [ { test: /\.css$/, loader: "style-loader!css-loader" } ];
在./src/js/index.js中 引入css文件
require(‘../css/index.css‘);
执行构建命令:./node_modules/webpack/bin/webpack.js,可以看到 ./src/css/index.css中的css代码 放在了./build/html/index.html文件的style标签内
5、本地服务 webpack-dev-server
npm install --save-dev webpack-dev-server
执行服务启动命令:./node_modules/.bin/webpack-dev-server --progress --host 0.0.0.0 --port 8080 --colors --inline --hot --display-error-details --content-base src/
你可以通过浏览器输入下面地址来访问你的项目:
http://0.0.0.0:8080/html
localhost:8080/html
你的ip:8080/html
ok,也可以通过配置 webpack.config.js
var HtmlWebpackPlugin = require(‘html-webpack-plugin‘); var plugins = []; var loaders = [ { test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" }, { test: /\.css$/, loader: "style-loader!css-loader" } ]; plugins.push( new HtmlWebpackPlugin({ template: ‘./src/html/index.html‘, filename: ‘html/index.html‘, inject: ‘body‘, hash: true, cache: true, showErrors: true, chunks: [‘js/index‘] }) ); module.exports = { entry: { ‘js/index‘: ‘./src/js/index.js‘ }, output: { path: ‘./build‘, filename: ‘[name].js‘ }, devServer: { progress: true, host: ‘0.0.0.0‘, port: 8080, colors: true, inline: true, // hot: true, contentBase: ‘./src‘, displayErrorDetails: true }, module: { loaders: loaders }, plugins: plugins };
配置完了后,我们 在执行命令 ./node_modules/.bin/webpack-dev-server,ok,成功了
我们随便修改一下 ./src/html/index.html代码(也可以修改css,js代码),浏览器页面将会自动刷新,实时预览,神奇吧....
6、多文件自动构建
// webpack.config.js var glob = require(‘glob‘); var path = require(‘path‘); var HtmlWebpackPlugin = require(‘html-webpack-plugin‘); var source = getSource(); var loaders = [ { test: /\.js$/, exclude: /node_modules/, loader: "babel-loader" }, { test: /\.css$/, loader: "style-loader!css-loader" } ]; var plugins = (function() { var arr = []; source.htmlFiles.forEach(function(htmlFile) { arr.push( new HtmlWebpackPlugin({ template: htmlFile.pageSource, filename: htmlFile.filename, inject: ‘body‘, hash: true, cache: true, showErrors: true, chunks: [htmlFile.jsChunkName] }) ); }); return arr; }()); module.exports = { entry: source.entry, output: { path: ‘./build‘, filename: ‘[name].js‘ }, devServer: { progress: true, host: ‘0.0.0.0‘, port: 8080, colors: true, inline: true, hot: true, contentBase: ‘./src‘, displayErrorDetails: true }, module: { loaders: loaders }, plugins: plugins }; function getSource() { var source = { htmlFiles: [], entry: {} }; var pageSource = glob.sync(‘./src/html/*.html‘); var jsSource = glob.sync(‘./src/js/**/*.js‘); var entry = {}; // 存储 all jsSource.forEach(function(item) { entry[‘js/‘ + path.basename(item, ‘.js‘)] = item; }); pageSource.forEach(function(page) { var jsChunkName = ‘js/‘ + path.basename(page, ‘.html‘); source.htmlFiles.push({ filename: ‘html/‘ + path.basename(page), pageSource: page, jsChunkName: jsChunkName }); source.entry[jsChunkName] = entry[jsChunkName]; }); return source; }
ps:转载请注明出处:杨君华