這次帶給大家webpack-dev-server的使用步奏，使用webpack-dev-server的注意事項有哪些，以下就是實戰案例，一起來看一下。
webpack-dev-server
webpack-dev-server是一個小型的Node.js Express伺服器,它使用webpack-dev-middleware來服務webpack的套件,除此自外，它還有一個透過Sock.js來連接到伺服器的微型執行時間.
我們來看一下下面的設定檔(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"
}
}登入後複製
這裡你將你的來源檔案放在app資料夾下,並透過webpack將其打包到build資料夾下的bundle.js中.
注意:webpack-dev -server是一個獨立的NPM套件,你可以透過npm install webpack-dev-server來安裝它.
基本目錄
webpack-dev-server預設會以當前目錄為基本目錄,除非你制定它.
webpack-dev-server --content-base build/
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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生成的包並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檔,然後在瀏覽器中輸入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>
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自動刷新
webpack-dev-server支援兩種模式來自動刷新頁面.
iframe模式(頁面放在iframe中,當改變時重載)
inline模式(將webpack-dev-sever的客戶端入口新增至套件(bundle))
兩種模式都支援熱模組替換(Hot Module Replacement).熱模組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 當以命令列啟動webpack-dev-server時,需要做兩點：
- #在命令列中加入--inline指令
- 在webpack.config.js中加入devServer:{inline:true}
2 當以Node.js API啟動webpack-dev-server時,我們也需要做兩點:
- 由於webpack-dev-server的配置中無inline選項,我們需要加入webpack-dev-server/client?http://«path»:«port»/到webpack配置的entry入口點.
- 將加入到html檔案中
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);登入後複製
在Node中執行上面的程式碼即可。
注意：webpack配置中的devSever配置項目只對在
命令列模式有效。
(Hot Module Replacement)熱模組替換
在命令列運行inline模式，並啟用熱模組替換
這裡只需要多增加--hot指令就OK了.如下所示.
webpack-dev-server --content-base build --inline --hot
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注意:命令列模式下,webpack.config.js中一定要配置output.publicPath來指定編譯後的包(bundle)的存取位置.
在Nodejs API中執行inline模式，並啟用熱模組替換
這裡需要做以下三點:
- 在webpack.config. js的entry選項中新增:webpack/hot/dev-server
- 在webpack.config.js的plugins選項中新增:new webpack.HotModuleReplacementPlugin()
- #在webpack-dev-server的設定中加入：hot:true
webpack-dev-server中的設定選項
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();登入後複製
相信看了本文案例你已經掌握了方法，更多精彩請關注php中文網其它相關文章！
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