h5唤起APP并检查是否成功

 // 检查app是否打开
 function checkOpen(cb) {
     const clickTime = +(new Date());
     function check(elsTime) {
         if (elsTime > 3000 || document.hidden || document.webkitHidden) {
             cb(true);
         } else {
             cb(false);
         }
     }
     // 启动间隔20ms运行的定时器，并检测累计消耗时间是否超过3000ms，超过则结束
     let count = 0;
     let intHandle = null;
     intHandle = setInterval(() => {
         count++;
         const elsTime = +(new Date()) - clickTime;
         if (count >= 100 || elsTime > 3000) {
             clearInterval(intHandle);
             check(elsTime);
         }
     }, 20);
 }
 /**
  * 唤起app
  * @param {any} uri  app schema
  * @param {any} fallback  唤起失败回调
  */
 function openApp(uri, fallback) {
     const ifr = document.createElement('iframe');
     ifr.src = uri;
     ifr.style.display = 'none';
     if (fallback) {
         checkOpen((opened) => {
             if (!opened) {
                 fallback();
             }
         });
     }
     document.body.appendChild(ifr);
     setTimeout(() => {
         document.body.removeChild(ifr);
     }, 2000);
 }