<script type="text/javascript">
var executar = function() {
var caractere = "\
Octal:.....................\251, \256, \266 \n\
Latin 1 Hexadecimal:....\xA9, \xAE, \xB6 \n\
Latin 1 Unicode:.........\u00A9, \u00AE, \u00B6"
alert(caractere);
}
</script>
<button type="button" onclick="executar()">Mostrar caracteres</button>