<meta charset="UTF-8">
<script>
function pulaLinha(){
document.write("<br><br>");
}
function mostra(frase){
document.write(frase);
pulaLinha();
}
var n = 0;
while(n <= 20){
mostra("Números de " + ( 20 - n ));
n = n + 1;
}
mostra("Fim")
</script>
