HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>setCookie helper</title>
</head>
<body>
  <h1>setCookie helper</h1>
  <button type="button" id="set">Set greeting</button>
  <pre id="out"></pre>
  <script>
    function setCookie(name, value, maxAgeSeconds) {
      var encoded = encodeURIComponent(value);
      var cookie = name + "=" + encoded + "; path=/; SameSite=Lax";
      if (typeof maxAgeSeconds === "number") {
        cookie += "; max-age=" + maxAgeSeconds;
      }
      if (location.protocol === "https:") {
        cookie += "; Secure";
      }
      document.cookie = cookie;
    }

    document.getElementById("set").addEventListener("click", function () {
      setCookie("greeting", "Hello, world!", 604800);
      document.getElementById("out").textContent = document.cookie;
    });
  </script>
</body>
</html>

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JavaScript Cookies Write — setCookie helper (Try It)