js检测手机上是否有此APP，有的话打开应用，没有的话跳转到appstore

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//html代码中的 a 标签，以微信为例，默认的是调用weixin scheme，去打开本机的微信，如果没有则跳转到相应连接
<a href="weixin://" class="btn-download">立即打开</a>

// 为btn-download 绑定事件，如果在500ms内，没有解析到协议，那么就会跳转到下载链接
var appstore, ua = navigator.userAgent;
if(ua.match(/Android/i)){
appstore = 'market://search?q=com.singtel.travelbuddy.android';
}
if(ua.match(/iphone|ipod|ipad/)){
appstore = "https://itunes.apple.com/cn/app/wei-xin/id414478124?mt=8&ign-mpt=uo%3D4";
}
function applink(fail){
return function(){
var clickedAt = +new Date;
// During tests on 3g/3gs this timeout fires immediately if less than 500ms.
setTimeout(function(){
// To avoid failing on return to MobileSafari, ensure freshness!
if (+new Date - clickedAt < 2000){
window.location = fail;
}
}, 500);
};
}
$('.icon-download, .btn-download')[0].onclick = applink(appstore);