webpack-dev-server
webpack-dev-server是一个小型的node.js express服务器,它使用webpack-dev-middleware来服务于webpack的包,除此自外,它还有一个通过sock.js来连接到服务器的微型运行时.
我们来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" } }
这里你将你的源文件放在app文件夹下,并通过webpack将其打包到build文件夹下的bundle.js中.
注意:webpack-dev-server是一个独立的npm包,你可以通过npm install webpack-dev-server来安装它.
基本目录
webpack-dev-server默认会以当前目录为基本目录,除非你制定它.
webpack-dev-server --content-base build/
上述命令是在命令行中执行的,它将build目录作为根目录.有一点需要注意的是:webpack-dev-server生成的包并没有放在你的真实目录中,而是放在了内存中.
我们在基本目录下新建一个文件,然后在浏览器中输入http://localhost:8080访问.
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>document</title> </head> <body> <script src="assets/bundle.js"></script> </body> </html>
自动刷新
webpack-dev-server支持两种模式来自动刷新页面.
两种模式都支持热模块替换(hot module replacement).热模块替换的好处是只替换更新的部分,而不是页面重载.
iframe模式
使用这种模式不需要额外的配置,只需要以下面这种url格式访问即可
http://«host»:«port»/webpack-dev-server/«path»
例如:http://localhost:8080/webpack-dev-server/.
inline模式
inline模式下我们访问的url不用发生变化,启用这种模式分两种情况:
1 当以命令行启动webpack-dev-server时,需要做两点:
2 当以node.js api启动webpack-dev-server时,我们也需要做两点:
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中运行上面的代码即可。
注意:webpack配置中的devsever配置项只对在命令行模式有效。
(hot module replacement)热模块替换
在命令行中运行inline模式,并启用热模块替换
这里只需要多增加 --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来指定编译后的包(bundle)的访问位置.
在nodejs api中运行inline模式,并启用热模块替换
这里需要做以下三点:
webpack-dev-server中的配置选项
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array, or: contentbase: "http://localhost/", hot: true, // enable special support for hot module replacement // page is no longer updated, but a "webpackhotupdate" message is send to the content // use "webpack/hot/dev-server" as additional module in your entry point // note: this does _not_ add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();
参考:
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