calculate length of the string

        
<!DOCTYPE html>
<html>
    <head>
        <title>calculate length of the string</title>
    </head>
    <body>
    <h1>calculate length of the string</h1>
    <form name="f1">
    
    <input type="submit" value="calculate length" onclick="length()">
    
    </form>
    <script type="text/javascript">
    function length()
        { 
            event.preventDefault();
            var str;
            str="Information Technology";
            document.write("Length of the string=" + str.length);
        }
    </script>
    </body>
</html>
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