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TypeError no detectado: no se pueden establecer las propiedades de la extensión cromada nula (configurando 'innerHTML')

Estoy tratando de construir esta extensión de Chrome que te avisa una vez que el temporizador termina y debería ser automático. Sin embargo, sigo recibiendo los errores.

Error de referencia no capturado: el temporizador no está definido

TypeError no capturado: no se pueden establecer propiedades de nulo (configurando 'innerHTML')

 var startingMinutes = 30; let time = startingMinutes * 60; setInterval(function () { const timer = document.getElementById('timer'); const minutes = Math.floor(time / 60); let seconds = time % 60; seconds = seconds < 10 ? '0' + seconds : seconds; timer.innerHTML = `${minutes}:${seconds}`; time--; time = time < 0 ? 0 : time; if (time == 0) { fn(); time = startingMinutes * 60; return; } function fn() { alert("!") } }, 1000);
about 4 years ago · Santiago Gelvez
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