JS判断手机是否装了APP，若装了则打开APP，否则跳转到相应的下载链接

 window.location = "healthMall://healthplaza.cn/opengift?mobile=" + $("#mobile" ).text();
        setTimeout( function () {
            window.location = "itms-apps://itunes.apple.com/us/app/jian-shen-bao/id1101654485?ls=1&mt=8" ;//如果超时就跳转到app下载页
        }, 2000);