在浏览器判断是否安装app，并打开相应的页面

1、代码功能: 判断手机/平板是否安装app 如果安装 则调用app的scheme，传入url当作参数，来做后续操作 如果没有安装 则跳转到app store/google play 下载app

2、代码：

(function () {
    var openUrl = window.location.search;
    try {
        openUrl = openUrl.substring(1, openUrl.length);
    } catch (e) {}
    var isiOS = navigator.userAgent.match('iPad') || navigator.userAgent.match('iPhone') || navigator.userAgent.match(
        'iPod'),
        isAndroid = navigator.userAgent
            .match('Android'),
        isDesktop = !isiOS && !isAndroid;
    if (isiOS) {
        setTimeout(function () {
            window.location = "itms-apps://itunes.apple.com/app/[name]/[id]?mt=8";
        }, 25);
        window.location = "[scheme]://[host]?url=" + openUrl;
    } else if (isAndroid) {
        window.location = "intent://[host]/" + "url=" + openUrl + "#Intent;scheme=[scheme];package=[package_name];end";
    } else {
        window.location.href = openUrl;
    }
})();

3、源：http://sentsin.com/web/1050.html