[解決済み] setInterval()関数を一時停止するには？

var output = $('h1');
var isPaused = false;
var time = 0;
var t = window.setInterval(function() {
  if(!isPaused) {
    time++;
    output.text("Seconds: " + time);
  }
}, 1000);

//with jquery
$('.pause').on('click', function(e) {
  e.preventDefault();
  isPaused = true;
});

$('.play').on('click', function(e) {
  e.preventDefault();
  isPaused = false;
});

h1 {
    font-family: Helvetica, Verdana, sans-serif;
    font-size: 12px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h1>Seconds: 0</h1>
<button class="play">Play</button>
<button class="pause">Pause</button>