HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery .slice() random</title>

  <style>

   div { width: 40px; height: 40px; margin: 10px; float: left; border: 2px solid blue; }

    span { color: red; font-weight: bold; display: block; clear: both; margin-top: 8px; }

    button { margin: 5px; clear: both; }

  </style>

</head>

<body>

  <div></div><div></div><div></div><div></div><div></div><div></div>

  <button type="button">Turn slice yellow</button>

  <span>Click the button!</span>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    function colorEm() {

      var $div = $("div");

      var start = Math.floor(Math.random() * $div.length);

      var end = Math.floor(Math.random() * ($div.length - start)) + start + 1;

      if (end === $div.length) end = undefined;

      $div.css("background", "");

      if (end) {

        $div.slice(start, end).css("background", "yellow");

        $("span").text("$('div').slice(" + start + ", " + end + ").css('background','yellow');");

      } else {

        $div.slice(start).css("background", "yellow");

        $("span").text("$('div').slice(" + start + ").css('background','yellow');");

      }

    }

    $("button").on("click", colorEm);

  </script>

</body>

</html>

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jQuery .slice() — random range button (Try It)