�我们再试试创建唯一的iframe 用于动态加载第三方页面：
	var createSingleIframe = getSingle(function () {
		var iframe = document.createElement('iframe');
		document.body.appendChild(iframe);
		return iframe;
	});
	document.getElementById('loginBtn').onclick = function () {
		var loginLayer = createSingleIframe();
		loginLayer.src = 'http://baidu.com';
	};

	var bindEvent = function () {
		$('div').one('click', function () {
			alert('click');
		});
	};
	var render = funct