L5-HTMLPage15a.html

﻿<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">

<head>
  <meta charset="utf-8" />
  <title>Variable scope</title>
  <script>
    function addNumbers() {
      var x1 = 3;
      var x2 = 4;

      var sum = doAddition(x1, x2);

      alert("The sum of " + x1 + " and " + x2 + " is " + sum);
    }

    function doAddition(input1, input2) {
      var result = input1 + input2;
      return (result);
    }
  </script>
</head>

<body>
  <h1>JavaScript user input</h1>
  <button onclick="addNumbers()">Arguments and returns</button>
</body>
</html>