gistfile1.js

(function(){
	var loadCount = 0;
	var scriptURL = [
		'//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js',
		'//ajax.googleapis.com/ajax/libs/jqueryui/1.9.2/jquery-ui.min.js'
	];

	function getScript(src, callback) {
		var head = document.getElementsByTagName('head')[0];
		var script = document.createElement('script');
		script.type = 'text/javascript';
		script.onreadystatechange = function () {
			if(this.readyState == 'complete') {
				callback.apply();
			}
		}
		script.onload = callback; // IE対策
		script.src = src;
		head.appendChild(script);
	}

	function loadScripts() {
		getScript(scriptURL[loadCount], function(){
			loadCount++;
			console.log('loaded');
			if(loadCount < scriptURL.length) {
				loadScripts();
			}
		});
	}

	window.onload = loadScripts;
})();