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Editorial Team
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Asked: 2026-06-10T21:19:35+00:00

I am newbie of JavaScript and studying with textbook. I wrote below code, and

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I am newbie of JavaScript and studying with textbook. I wrote below code, and alert modal window was displayed correctly, but document.writeln(triangle(8,5)) does nothing. Why?

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Area of Triangle</title>
</head>
<body>
    <h1>Area of Triangle</h1>
    <pre>
        <script type="text/javascript" charset="utf-8">
            <!--

            var triangle;

            triangle = function(base, height) {
              return base * height / 2;
            };

            alert(triangle(8, 5));

            documnt.writeln(triangle(8, 5));

            -->
        </script>
    </pre>
</body>
</html>

Thank you for your kindness.

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1 Answer

  1. Editorial Team

    You’ve misspelled document as documnt. Try:

    document.writeln(triangle(8, 5));
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