HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setTimeout vs setInterval</title>
</head>
<body>
  <h1>Timeout vs interval</h1>
  <p>
    <button type="button" id="go">Run both</button>
    <button type="button" id="stop">Stop interval</button>
  </p>
  <pre id="out">Click Run both</pre>
  <script>
    (function () {
      var out = document.getElementById("out");
      var id = null;

      document.getElementById("go").onclick = function () {
        clearInterval(id);
        out.textContent = "";
        setTimeout(function () {
          out.textContent += "timeout once\n";
        }, 1000);
        id = setInterval(function () {
          out.textContent += "interval\n";
        }, 1000);
      };

      document.getElementById("stop").onclick = function () {
        clearInterval(id);
        id = null;
        out.textContent += "interval stopped\n";
      };
    })();
  </script>
</body>
</html>

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JavaScript setTimeout() vs setInterval (Try It)