Solucio classe text

function text(){

var text= "cadena de caracters";

this.afegirCaracter=function(caracter)
{
	return text+=""+caracter;
}


this.contarVocals=function()
{
var cont=0;
var texto=text.split("");
for (var i = texto.length - 1; i >= 0; i--) {
	if(texto[i]=='a' ||texto[i]=='e'|| texto[i]=='i' ||texto[i]=='o' ||texto[i]=='u'){
		cont++;
	}
};

return cont;
}

this.mostrarText=function()
{
	console.log(text);
}
}




var texto= new text();
texto.afegirCaracter("a");
texto.contarVocals();
texto.mostrarText();