Javascript function return multi values

function calculer_montant_service(txTva){

var ht = 100;

var tva = 0;

var ttc = 0;

ttc = ht * ((100 + txTva)/100);

tva = ttc - ht;

return{

ht : ht,

tva: tva,

ttc: ttc

};

}

var result = calculer_montant_service(19);

alert(result.ht);

alert(result.tva);

alert(result.ttc);