我遵循了使用Firebase作为后端设置React Social的教程。配置Firebase（通过'firebase init'）后，当我在命令行输入'npm start'时，我现在在Web浏览器中收到此错误。我不知道如何解释这个或如何解决它。任何帮助将不胜感激！
Html Webpack插件： ReferenceError：未定义要素
的index.html：701 C：/RS_tut/react-social-network/public/index.html：701：10
index.html：704 ./node_modules/html-webpack-plugin/lib/loader.js！。/ public / index.html.module.exports C：/RS_tut/react-social-network/public/index.html：704：3
index.js：264 [反应-社交网络] / [HTML-的WebPack-插件] /index.js:264:16
从之前的活动开始：
index.js：252 HtmlWebpackPlugin.executeTemplate [反应-社交网络] / [HTML-的WebPack-插件] /index.js:252:6
index.js：137 [反应-社交网络] / [HTML-的WebPack-插件] /index.js:137:18
从之前的活动开始：
index.js：132编译器。 [反应-社交网络] / [HTML-的WebPack-插件] /index.js:132:8
Tapable.js：206 Compiler.applyPluginsAsyncSeries [反应-社交网络] / [tapable] /lib/Tapable.js:206:13
Compiler.js：358 Compiler.emitAssets [反应-社交网络] / [的WebPack] /lib/Compiler.js:358:8
Compiler.js：57 onCompiled [反应-社交网络] / [的WebPack] /lib/Compiler.js:57:19
Compiler.js：514 applyPluginsAsync.err [反应-社交网络] / [的WebPack] /lib/Compiler.js:514:14
Tapable.js：202 next [反应-社交网络] / [tapable] /lib/Tapable.js:202:11
CachePlugin.js：78编译器。 [反应-社交网络] / [的WebPack] /lib/CachePlugin.js:78:5
Tapable.js：206 Compiler.applyPluginsAsyncSeries [反应-社交网络] / [tapable] /lib/Tapable.js:206:13
Compiler.js：511 compilation.seal.err [反应-社交网络] / [的WebPack] /lib/Compiler.js:511:11
Tapable.js：195 Compilation.applyPluginsAsyncSeries [反应-社交网络] / [tapable] /lib/Tapable.js:195:46
Compilation.js：680 self.applyPluginsAsync.err [反应-社交网络] / [的WebPack] /lib/Compilation.js:680:19
Tapable.js：195 Compilation.applyPluginsAsyncSeries [反应-社交网络] / [tapable] /lib/Tapable.js:195:46
Compilation.js：671 self.applyPluginsAsync.err [反应-社交网络] / [的WebPack] /lib/Compilation.js:671:11
Tapable.js：195 Compilation.applyPluginsAsyncSeries [反应-社交网络] / [tapable] /lib/Tapable.js:195:46
Compilation.js：666 self.applyPluginsAsync.err [反应-社交网络] / [的WebPack] /lib/Compilation.js:666:10
Tapable.js：195 Compilation.applyPluginsAsyncSeries [反应-社交网络] / [tapable] /lib/Tapable.js:195:46
Compilation.js：662 sealPart2 [反应-社交网络] / [的WebPack] /lib/Compilation.js:662:9
Tapable.js：195 Compilation.applyPluginsAsyncSeries [反应-社交网络] / [tapable] /lib/Tapable.js:195:46
Compilation.js：605 Compilation.seal [反应-社交网络] / [的WebPack] /lib/Compilation.js:605:8
这是我的index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Welcome to Firebase Hosting</title>
<!-- update the version number as needed -->
<script defer src="/__/firebase/5.0.4/firebase-app.js"></script>
<!-- include only the Firebase features as you need -->
<script defer src="/__/firebase/5.0.4/firebase-auth.js"></script>
<script defer src="/__/firebase/5.0.4/firebase-database.js"></script>
<script defer src="/__/firebase/5.0.4/firebase-messaging.js"></script>
<script defer src="/__/firebase/5.0.4/firebase-storage.js"></script>
<!-- initialize the SDK after all desired features are loaded -->
<script defer src="/__/firebase/init.js"></script>
<style media="screen">
body { background: #ECEFF1; color: rgba(0,0,0,0.87); font-family: Roboto, Helvetica, Arial, sans-serif; margin: 0; padding: 0; }
#message { background: white; max-width: 360px; margin: 100px auto 16px; padding: 32px 24px; border-radius: 3px; }
#message h2 { color: #ffa100; font-weight: bold; font-size: 16px; margin: 0 0 8px; }
#message h1 { font-size: 22px; font-weight: 300; color: rgba(0,0,0,0.6); margin: 0 0 16px;}
#message p { line-height: 140%; margin: 16px 0 24px; font-size: 14px; }
#message a { display: block; text-align: center; background: #039be5; text-transform: uppercase; text-decoration: none; color: white; padding: 16px; border-radius: 4px; }
#message, #message a { box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); }
#load { color: rgba(0,0,0,0.4); text-align: center; font-size: 13px; }
@media (max-width: 600px) {
body, #message { margin-top: 0; background: white; box-shadow: none; }
body { border-top: 16px solid #ffa100; }
}
</style>
</head>
<body>
<div id="message">
<h2>Welcome</h2>
<h1>Firebase Hosting Setup Complete</h1>
<p>You're seeing this because you've successfully setup Firebase Hosting. Now it's time to go build something extraordinary!</p>
<a target="_blank" href="https://firebase.google.com/docs/hosting/">Open Hosting Documentation</a>
</div>
<p id="load">Firebase SDK Loading…</p>
<script>
document.addEventListener('DOMContentLoaded', function() {
// // 🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥
// // The Firebase SDK is initialized and available here!
//
// firebase.auth().onAuthStateChanged(user => { });
// firebase.database().ref('/path/to/ref').on('value', snapshot => { });
// firebase.messaging().requestPermission().then(() => { });
// firebase.storage().ref('/path/to/ref').getDownloadURL().then(() => { });
//
// // 🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥
try {
let app = firebase.app();
let features = ['auth', 'database', 'messaging', 'storage'].filter(feature => typeof app[feature] === 'function');
document.getElementById('load').innerHTML = `Firebase SDK loaded with ${features.join(', ')}`;
} catch (e) {
console.error(e);
document.getElementById('load').innerHTML = 'Error loading the Firebase SDK, check the console.';
}
});
</script>
</body>
</html>
答案 0 :(得分：1)
初始化Firebase托管时，您使用消除了反应初始化的Firebase样板来覆盖index.html。您可以修复它恢复到以前的版本或添加您的react根元素。