seçao 7 aula 36 JS udemy mudando propiedade obj

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
    <script>
function Caneta(preco, cor){

    var color = cor || 'balck';
    this.preco = preco || 1;
    this.mudarCor = function(cor){
      if(cor !== 'red' && cor !== 'blue' && cor !== 'black'){
          return;
      }else{
        color = cor;
      }
    }
    this.pegaCor = function(){
      return color;
    }
 }
 var caneta1 = new Caneta(2,'red');
  </script>

</body>
</html>