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  <meta charset="utf-8">
  <title>Swap with temp</title>
</head>
<body>
  <h1>Swap using a temp variable</h1>
  <p>Edit <code>num1</code> and <code>num2</code>, then <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      var num1 = 5;
      var num2 = 10;
      var lines = [];
      lines.push("Before swapping: num1 = " + num1 + ", num2 = " + num2);
      var temp = num1;
      num1 = num2;
      num2 = temp;
      lines.push("After swapping: num1 = " + num1 + ", num2 = " + num2);
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Swap Two Numbers — Temp Variable (Try It)