JSFiddle - React, Tailwind, and code Playground

HTML

<html>
  <head>
	<script src="https://www.gstatic.com/firebasejs/live/3.0/firebase.js"></script>
  </head>
  <body>
    <script>
	
	// Initialize Firebase
	var config = {
	apiKey: "專案API金鑰號碼",
	authDomain: "專案驗證網址",
	databaseURL: "https://專案資料庫網址",
	storageBucket: "",
	};
	firebase.initializeApp(config);

	// Basic Write Operations
	var fb = firebase.database().ref('aSetofRecords');
	// 迴圈執行incId()十次寫入10筆資料
	for (var i=0 ; i<10 ; i++) incId();

	// creates a new, incremental record
	// 參見 http://jsfiddle.net/firebase/xLq7grcc/
	// 參見 https://gist.github.com/katowulf/6158392
	function incId() {
		// When working with data that could be corrupted by concurrent modifications, 
		// such as incremental counters, you can use a transaction() operation to update. 
		// The update function takes the current state of the data as an argument 
		// and returns the new desired state you would like to write. 
		// If another client writes to the location before your new value is successfully written, 
		// your update function is called again with the new current value, and the write is retried.
		// This repeats until the transaction is accepted or you abort the transaction.
		// 參見 https://firebase.google.com/docs/database/web/save-data#save_data_as_transactions
		// 參見 https://firebase.google.com/docs/reference/js/firebase.database.Reference#transaction
		fb.child('counter').transaction(function(currentValue) {
			// Increment counter by 1, or set to 1 if it was undefined before.
			return (currentValue||0) + 1
		}, function(error, committed, currentData) { // an optional completion callback function
			// 參見 https://firebase.google.com/docs/reference/android/com/google/firebase/database/Transaction.Handler#public-methods
			if ( error ) 	// error: null if no errors occurred, otherwise it contains a description of the error
			   {
				setError(error);
			   }
			else if( committed ) // committed: True if the transaction successfully completed, false if it was aborted or...