添加收藏夹各个浏览器

function addfavorite(){
    switch (getOs()) {
        case 1:
            window.external.addFavorite('http://liangsongzhe.iteye.com/admin/blogs/new', 'javaeye');
            break;
        case 2:
            window.sidebar.addPanel('Web之路', 'http://liangsongzhe.iteye.com/admin/blogs/new
', "");
            break;
        case 0:
            alert("!!!!");
            break;
    }
}

function getOs(){
    if (navigator.userAgent.indexOf("MSIE") > 0) 
        return 1;
    if (isFirefox = navigator.userAgent.indexOf("Firefox") > 0) 
        return 2;
    if (isSafari = navigator.userAgent.indexOf("Safari") > 0) 
        return 3;
    if (isCamino = navigator.userAgent.indexOf("Camino") > 0) 
        return 4;
    if (isMozilla = navigator.userAgent.indexOf("Gecko/") > 0) 
        return 5;
    return 0;
}