The use of webpack automatic refresh and parsing
Mar 16, 2018 pm 02:29 PM
This time I will bring you the use of webpack automatic refresh and parsing. What are the precautions for using webpack automatic refresh and parsing? The following is a practical case, let's take a look.
The front end needs to frequently modify js and styles, and needs to be constantly adjusted according to the browser's page effect; and often our development directory and the local release directory are not the same, and we need to publish them after modification; another point That is, not all effects can be seen directly by double-clicking the page. We often need to use nginx to build a site locally to observe (it is ok on our own computer before putting it into the test environment). So if you have to manually refresh the browser and manually (or click) publish, and start the site, it is indeed a lot of physical work. And these three points webpack can help us do it. webpack-dev-serverWebpack implements automatic refresh through webpack-dev-server (WDS). WDS is a development server (an express) running in memory. After starting, it will detect whether the file has changed and automatically compile again. 1. Installationnpm?install?webpack-dev-server?--save-dev
First install it to the development directory through npm. After the installation is complete, it will be found under node_modules/bin. 2.npm startupThen modify package.json: (based on the previous section)
?"scripts":?{????"start":?"webpack-dev-server?--env?development",????"build":?"webpack?--env?production"
??}Now you can start it through npm run start or npm start.
webpack-dev-server?--env?developmentBut there will be a prompt that webpack-dev-server --env development is not an internal command. This kind of problem is a problem with environment variables. Just set the bin directory you developed to the environment variable, such as My directory is 'E:\Html5\node_modules\.bin', just add a semicolon at the end.
C:\Users\Administrator.9BBOFZPACSCXLG2\AppData\Roaming\npm;C:\Program?Files?(x86)\Microsoft?VS?Code\bin;E:\Html5\node_modules\.bin
???server{
??????listen???????8080;
??????location?/?{
???????????root???E:/Html5/build;
???????????index??index.html?index.htm;
????????}
????}Restart WDS:
?devServer:{???//...
????port:?9000}nodemon automatic startup WDS monitors development files, and changes to webpack.config.js will not cause automatic startup. So we need nodemon to do this.
npm?install?nodemon?--save-devFirst install it in the development directory, and then modify package.json:
?"scripts":?{???"start":?"nodemon?--watch?webpack.config.js?--exec?\"webpack-dev-server?--env?development\"",????"build":?"webpack?--env?production"
??},It is equivalent to letting nodemon monitor webpack.config.js and start it if it changes.
https://github.com/webpack/webpack-dev-server/tree/master/examples/proxy-advanced
module.exports?=?{
????context:?dirname,
????entry:?"./app.js",
????devServer:?{????????proxy:?{????????????"/api":?{
????????????????target:?"http://jsonplaceholder.typicode.com/",
????????????????changeOrigin:?true,
????????????????pathRewrite:?{????????????????????"^/api":?""
????????????????},
????????????????bypass:?function(req)?{????????????????????if(req.url?===?"/api/nope")?{????????????????????????return?"/bypass.html";
????????????????????}
????????????????}
????????????}
????????}
????}
}Replace the api field with http://jsonplaceholder.typicode.com/ and delete it from the original address so that you can implement the proxy yourself. Everyone is happy! WDS implements proxy through http-proxy-middleware. More references: http://webpack.github.io/docs/webpack-dev-server.html#bypass-the-proxy;https://github.com/chimurai/http-proxy-middleware#options
but，這種刷新是怎么實現(xiàn)的呢？因為頁面上沒有嵌入什么別的js，去翻原碼 web-dev-server/server.js中有這么一段：
Server.prototype._watch?=?function(path)?{????const?watcher?=?chokidar.watch(path).on("change",?function()?{????????this.sockWrite(this.sockets,?"content-changed");
????}.bind(this))????this.contentBaseWatchers.push(watcher);
}
用chokidar來監(jiān)視文件變化,server的內(nèi)部維護的有一個socket集合：
Server.prototype.sockWrite?=?function(sockets,?type,?data)?{
????sockets.forEach(function(sock)?{
????????sock.write(JSON.stringify({
????????????type:?type,
????????????data:?data
????????}));
????});
}
sock是一個sockjs對象。https://github.com/sockjs/sockjs-client，從http://localhost:8080/webpack-dev-server/頁面來看，sockjs是用來通信記錄日志的。 ?
var?onSocketMsg?=?{
????hot:?function()?{
????????hot?=?true;
????????log("info",?"[WDS]?Hot?Module?Replacement?enabled.");
????},
????invalid:?function()?{
????????log("info",?"[WDS]?App?updated.?Recompiling...");
????????sendMsg("Invalid");
????},
????hash:?function(hash)?{
????????currentHash?=?hash;
????},
...
}
我們在看app.js,其中有一個OnSocketMsg 對象。
var?onSocketMsg?=?{
????hot:?function()?{
????????hot?=?true;
????????log("info",?"[WDS]?Hot?Module?Replacement?enabled.");
????},
????invalid:?function()?{
????????log("info",?"[WDS]?App?updated.?Recompiling...");
????????sendMsg("Invalid");
????},
????hash:?function(hash)?{
????????currentHash?=?hash;
????},????"still-ok":?function()?{
????????log("info",?"[WDS]?Nothing?changed.")????????if(useWarningOverlay?||?useErrorOverlay)?overlay.clear();
????????sendMsg("StillOk");
????},????"log-level":?function(level)?{
????????logLevel?=?level;
????},????"overlay":?function(overlay)?{????????if(typeof?document?!==?"undefined")?{????????????if(typeof(overlay)?===?"boolean")?{
????????????????useWarningOverlay?=?overlay;
????????????????useErrorOverlay?=?overlay;
????????????}?else?if(overlay)?{
????????????????useWarningOverlay?=?overlay.warnings;
????????????????useErrorOverlay?=?overlay.errors;
????????????}
????????}
????},
????ok:?function()?{
????????sendMsg("Ok");????????if(useWarningOverlay?||?useErrorOverlay)?overlay.clear();????????if(initial)?return?initial?=?false;
????????reloadApp();
????},????"content-changed":?function()?{
????????log("info",?"[WDS]?Content?base?changed.?Reloading...")
????????self.location.reload();
????},
????warnings:?function(warnings)?{
????????log("info",?"[WDS]?Warnings?while?compiling.");????????var?strippedWarnings?=?warnings.map(function(warning)?{????????????return?stripAnsi(warning);
????????});
????????sendMsg("Warnings",?strippedWarnings);????????for(var?i?=?0;?i?<?strippedWarnings.length;?i++)
????????????console.warn(strippedWarnings[i]);????????if(useWarningOverlay)?overlay.showMessage(warnings);????????if(initial)?return?initial?=?false;
????????reloadApp();
????},
????errors:?function(errors)?{
????????log("info",?"[WDS]?Errors?while?compiling.?Reload?prevented.");????????var?strippedErrors?=?errors.map(function(error)?{????????????return?stripAnsi(error);
????????});
????????sendMsg("Errors",?strippedErrors);????????for(var?i?=?0;?i?<?strippedErrors.length;?i++)
????????????console.error(strippedErrors[i]);????????if(useErrorOverlay)?overlay.showMessage(errors);
????},
????close:?function()?{
????????log("error",?"[WDS]?Disconnected!");
????????sendMsg("Close");
????}
};
View Code
ok的時候觸發(fā)一個reloadApp
function?reloadApp()?{????if(hot)?{
????????log("info",?"[WDS]?App?hot?update...");????????var?hotEmitter?=?webpack_require("./node_modules/webpack/hot/emitter.js");
????????hotEmitter.emit("webpackHotUpdate",?currentHash);????????if(typeof?self?!==?"undefined")?{????????????//?broadcast?update?to?window
????????????self.postMessage("webpackHotUpdate"?+?currentHash,?"*");
????????}
????}?else?{
????????log("info",?"[WDS]?App?updated.?Reloading...");????????self.location.reload();
????}
}
也就是說WDS先檢測文件是否變化，然后通過sockjs通知到客戶端，這樣就實現(xiàn)了刷新。之前WebSocket的第三方只用過socket.io,看起來sockjs也蠻好用的。不必外帶一個js，在主js里面就可以寫了。
相信看了本文案例你已經(jīng)掌握了方法，更多精彩請關(guān)注php中文網(wǎng)其它相關(guān)文章！
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