JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://getfirebug.com/firebug-lite-debug.js"></script>
<!-- disregard this pane, html is shown in the "result" pane -->




































































<h4><strong>&larr; Code Example from <a href="http://www.javascriptenlightenment.com/" target="_blank">JavaScript Enlightenment Book</a> by <a href="http://www.codylindley.com" target="_blank">Cody Lindley</a></strong></h4>

<p>JavaScript code is executed on page load. Click the "Run" button in the top bar to re-run the JavaScript code. Output is logged to the <a href="http://getfirebug.com/firebuglite" target="_blank">Firebug Lite</a> console below &darr;.</p>

JavaScript

var myFunction = function() { 
	var foo = 'bar'; 
};
/* fooはmyFunction()のスコープ内 */

var myApp = function() {
	var run = function() {
		try {
			console.log( foo ); // スコープチェーンにfooが存在しないためエラーが発生
		} 
		catch(e) {
			console.log( e );
		}
	}();
}