	var div;
		return function () {
			if (!div) {
				div = document.createElement('div');
				div.innerHTML = '我是登录浮窗';
				div.style.display = 'none';
				document.body.appendChild(div);
			}
			return div;
		}
	})();

	document.getElementById('loginBtn').onclick = function () {
		var loginLayer = createLoginLayer();
		loginLayer.style.display = 'block';
	};

	var createIframe = (function () {
		var iframe;
		return function () {
			if (!iframe) {
				iframe = document.creat