fix: remove setInterval

(cherry picked from commit 034fe900)

src/jensen.js

@@ -705,7 +705,6 @@ Jensen.prototype.getFile = async function (filename, length, ondata, onprogress)
     for (let i = 0; i < filename.length; i++) fname.push(filename.charCodeAt(i));
 
     let wakeLock = null;
-    let timer = null;
     function visibilitychange() {
         let audio = document.getElementById('test_audio');
         if (!audio) {
@@ -721,14 +720,10 @@ Jensen.prototype.getFile = async function (filename, length, ondata, onprogress)
         if (document.visibilityState === 'hidden') {
             console.log('Page is hidden');
             audio.play();
-            timer = setInterval(() => {
-                console.log("Keeping the page alive...");
-            }, 1000)
         } else {
             audio.pause();
             console.log('Page is visible');
             wakeLock && wakeLock.release();
-            timer && clearInterval(timer)
         }
     }
 
@@ -745,7 +740,6 @@ Jensen.prototype.getFile = async function (filename, length, ondata, onprogress)
         const audio = document.getElementById('test_audio');
         audio && audio.pause() && audio.remove();
         wakeLock && wakeLock.release();
-        timer && clearInterval(timer)
         console.log('Clear event and task.');
     }