Sum numbers toCurrency

HTML

<form>
        <input id="nome" type="text" value="LocalHost"/>
        <input id="email" type="email" value="[email protected]"/>
        <input id="tel" type="tel" onChange="funcao(nome.value, email.value, tel.value)" value="(62)90000-0000"/>       
    </form>

JavaScript

function funcao(nome, email, telefone) {      
   alert("nome: " + nome +" email: "+ email +" telefone: "+ telefone);
		   
  }