webpack-dev-server
webpack-dev-server是一個小型的Node.js Express服務器,它使用webpack-dev-middleware來服務于webpack的包,除此自外，它還有一個通過Sock.js來連接到服務器的微型運行時.
我們來看一下下面的配置文件(webpack.config.js)
var path = require("path");module.exports = { entry:{ app:["./app/main.js"] }, output:{ path:path.resolve(__dirname,"build"), publicPath:"/assets/", filename:"bundle.js"}}這里你將你的源文件放在app文件夾下,并通過webpack將其打包到build文件夾下的bundle.js中.
注意:webpack-dev-server是一個獨立的NPM包,你可以通過npm install webpack-dev-server來安裝它.
基本目錄
webpack-dev-server默認會以當前目錄為基本目錄,除非你制定它.
webpack-dev-server --content-base build/
上述命令是在命令行中執行的,它將build目錄作為根目錄.有一點需要注意的是:webpack-dev-server生成的包并沒有放在你的真實目錄中,而是放在了內存中.
我們在基本目錄下新建一個index.html文件,然后在瀏覽器中輸入http://localhost:8080訪問.
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title></head><body> <script src="assets/bundle.js"></script></body></html>
自動刷新
webpack-dev-server支持兩種模式來自動刷新頁面.
兩種模式都支持熱模塊替換(Hot Module Replacement).熱模塊替換的好處是只替換更新的部分,而不是頁面重載.
iframe模式
使用這種模式不需要額外的配置,只需要以下面這種URL格式訪問即可
http://«host»:«port»/webpack-dev-server/«path»
例如:http://localhost:8080/webpack-dev-server/index.html.
inline模式
inline模式下我們訪問的URL不用發生變化,啟用這種模式分兩種情況:
1 當以命令行啟動webpack-dev-server時,需要做兩點：
2 當以Node.js API啟動webpack-dev-server時,我們也需要做兩點:
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:8080/");var compiler = webpack(config);var server = new WebpackDevServer(compiler, { contentBase:'build/', publicPath: "/assets/"});server.listen(8080);在Node中運行上面的代碼即可。
注意：webpack配置中的devSever配置項只對在命令行模式有效。
(Hot Module Replacement)熱模塊替換
在命令行中運行inline模式，并啟用熱模塊替換
這里只需要多增加 --hot指令就OK了.如下所示.
webpack-dev-server --content-base build --inline --hot
注意:命令行模式下,webpack.config.js中一定要配置output.publicPath來指定編譯后的包(bundle)的訪問位置.
在Nodejs API中運行inline模式，并啟用熱模塊替換
這里需要做以下三點:
webpack-dev-server中的配置選項
var WebpackDevServer = require("webpack-dev-server");var webpack = require("webpack");var compiler = webpack({ // configuration});var server = new WebpackDevServer(compiler, { // webpack-dev-server options contentBase: "/path/to/directory", // Can also be an array, or: contentBase: "http://localhost/", hot: true, // Enable special support for Hot Module Replacement // Page is no longer updated, but a "webpackHotUpdate" message is send to the content // Use "webpack/hot/dev-server" as additional module in your entry point // Note: this does _not_ add the `HotModuleReplacementPlugin` like the CLI option does. // Set this as true if you want to access dev server from arbitrary url. // This is handy if you are using a html5 router. historyApiFallback: false, // Set this if you want to enable gzip compression for assets compress: true, // Set this if you want webpack-dev-server to delegate a single path to an arbitrary server. // Use "**" to proxy all paths to the specified server. // This is useful if you want to get rid of 'http://localhost:8080/' in script[src], // and has many other use cases (see https://github.com/webpack/webpack-dev-server/pull/127 ). proxy: { "**": "http://localhost:9090" }, setup: function(app) { // Here you can access the Express app object and add your own custom middleware to it. // For example, to define custom handlers for some paths: // app.get('/some/path', function(req, res) { // res.json({ custom: 'response' }); // }); }, // pass [static options](http://expressjs.com/en/4x/api.html#express.static) to inner express server staticOptions: { }, // webpack-dev-middleware options quiet: false, noInfo: false, lazy: true, filename: "bundle.js", watchOptions: { aggregateTimeout: 300, poll: 1000 }, // It's a required option. publicPath: "/assets/", headers: { "X-Custom-Header": "yes" }, stats: { colors: true }});server.listen(8080, "localhost", function() {});// server.close();參考:http://webpack.github.io/docs/webpack-dev-server.html
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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