<!-- oefening 1 -->
<!DOCTYPE html>
<html lang="nl">
<head>
<title>Oefening 1</title>
</head>
<body>
<script type="text/javascript">
var a = 12.345;
document.write(a);
document.write('<BR>');
document.write('Decimalen: ' + a.toFixed(2));
document.write('<BR>');
document.write('Lengte: ' + a.toPrecision(4));
</script>
</body>
</html>
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<!-- oefening 2 -->
<!DOCTYPE html>
<html lang="nl">
<head>
<title>Oefening 2</title>
</head>
<body>
<script type="text/javascript">
var a = 'Hello World';
document.write(a.toLowerCase());
document.write('<BR>');
document.write(a.toUpperCase());
</script>
</body>
</html>
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<!-- oefening 3 -->
<!DOCTYPE html>
<html lang="nl">
<head>
<title>Oefening 3</title>
</head>
<body>
<script type="text/javascript">
var a = prompt("Vul het 1e getal in");
var b = prompt("Vul het 2e getal in");
document.write(a);
document.write('+');
document.write(b);
document.write('=');
document.write(parseInt(a) + parseInt(b));
</script>
</body>
</html>
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<!-- oefening 4 -->
<!DOCTYPE html>
<html lang="nl">
<head>
<title>Oefening 4</title>
</head>
<body>
<script type="text/javascript">
var a = 'Hello World';
document.write(a);
document.write('<BR>');
document.write('Lengte: ' + a.length);
document.write('<BR>');
document.write('World begint op positie: ' + a.indexOf("World"));
document.write('<BR>');
document.write('Positie 6 t/m 11: ' + a.substring(6,11));
document.write('<BR>');
document.write('World vervangen door Plantet: ' + a.replace("World","Planet"));
</script>
</body>
</html>
Download hier het bestand.