這篇文章主要介紹了詳解webpack-dev-server的簡單使用，現在分享給大家，也要為大家做個參考。一起跟隨小編過來看看吧
webpack-dev-server
#webpack-dev-server是一個小型的Node.js Express伺服器,它使用webpack-dev-middleware來服務於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運行時.
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預設會以目前目錄為基本目錄,除非你制定它.
webpack-dev-server --content-base build/
登入後複製
上述命令是在命令列中執行的,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>
登入後複製
#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,當發生改變時重載)
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模式下我們造訪的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的設定中無inline選項,我們需要加入webpack-dev-server/client?http://«path»:«port»/到webpack配置的entry入口點中.
將加入html檔案
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中運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
#在命令列中執行inline模式，並啟用熱模組取代
這裡只要要多增加--hot指令就OK了.如下所示.
webpack-dev-server --content-base build --inline --hot
登入後複製
#注意:命令列模式下,webpack.config.js中一定要配置output.publicPath來指定編譯後的套件(bundle)的存取位置.
在Nodejs API中運行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選項中加入:webpack/hot/dev-server
在webpack. config.js的plugins選項中新增:new webpack.HotModuleReplacementPlugin()
在webpack-dev-server的設定中新增：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
參考:http://webpack.github.io/docs/webpack- dev-server.html
相關推薦：
webpack-dev-server怎麼設定遠端模式
webpack-dev-server使用http-proxy解決跨域問題詳解
###################################################
以上是詳解webpack-dev-server的簡單使用_javascript技巧的詳細內容。更多資訊請關注PHP中文網其他相關文章！
