The console appears "Uncaught ReferenceError: Circle is not defined at scratch.html: 9"
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Objetos</title>
</head>
<body>
<script>
c = new Circulo(13, 11, 5);
document.write('<p>Constructor: <pre>' + c.constructor + '</pre></p>');
</script>
</body>
</html>How can I resolve?
You must first define Circulo . At the time you create the instance of Circulo , it is, in that context, undefined.
You must first create your class:
// Criando a classe:
function Circulo(p1, p2, p3) {
this.p1 = p1;
this.p2 = p2;
this.p3 = p3;
// ...
}
// Criando uma instância da classe
var c = new Circulo(1, 2, 3);
console.log(c.constructor);If you are using newer versions of JavaScript, you can do this:
// Criando a classe:
class Circulo {
constructor(p1, p2, p3) {
this.p1 = p1;
this.p2 = p2;
this.p3 = p3;
// ...
}
}
// Criando uma instância da classe
let c = new Circulo(1, 2, 3);
console.log(c.constructor);You have to define the constructor method before:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Objetos</title>
</head>
<body>
<script>
function Circulo (a, b, c) {
this.a = a;
this.b = b;
this.c = c;
}
var c = new Circulo(13, 11, 5);
document.write('<p>Constructor: <pre>' + c.constructor + '</pre></p>');
</script>
</body>
</html>