Url scheme是iOS，Android平臺都支援，只需要原生APP開發時註冊scheme， 那麼使用者點選到此類連結時，會自動跳到APP。比如

//1、淘寶：“taobao://”
//2、支付寶：“alipays://platformapi/startapp?appId=20000067&url=”,20000067 代表錢包內部應用的ID
//3、天貓：“tmall://page.tm/webview?webURLString=”
//4、淘寶電影：“tbmovie://taobao.com/h5jump?url=”

<script>
function makeHiddenIframe(url) {
var ua = navigator.userAgent.toLowerCase();
if( ua.match(/iphone os 9/i) == "iphone os 9" ) {
window.setTimeout(function() {location.href = url;},100);
}else{
var ifa = document.createElement('iframe');
ifa.style.display = 'none';
ifa.src = url;
document.body.appendChild(ifa);
var openTime = +new Date();
window.setTimeout(function(){
document.body.removeChild(ifa);
if( (+new Date()) - openTime > 2500 ){
location.href = url;
}
},2000);
}
}
makeHiddenIframe('saaslunch://btdai/haha');
</script>