javascript功能：添加到收藏夾

function addFavorite() {
	var ctrl = (navigator.userAgent.toLowerCase()).indexOf('mac') != -1 ? 'Command/Cmd': 'CTRL';
	var url = document.location.href;
	var title = document.title;
	if (document.all) {
	window.external.addFavorite(url, title);
	} else if (window.sidebar) {
	window.sidebar.addPanel(title, url, "");
	} else {
	alert('您可以嘗試通過快捷鍵' + ctrl + ' + D 加入到收藏夾');
	}
	}