<!DOCTYPE html>
<html>
<head>
</head>
<body>
<!--El botón tiene un atributo onclick que llama a la función-->
<button onclick="cambiaTexto()">Pulsa aquí</button>
<p>Cuando hagas clic en el botón se cargará una función. La función cambiará el texto</p>
<script>
/* La función, llamada cambiaTexto, escribre en el objeto
documento el texto que se pasa como argumento en el método write*/
function cambiaTexto()
{
document.write("Cerrad la puerta cuando vayáis a salir");
}
</script>
</body>
</html>
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