27 lines
391 B
Markdown
27 lines
391 B
Markdown
That's because the child constructor must call `super()`.
|
|
|
|
Here's the corrected code:
|
|
|
|
```js run
|
|
class Animal {
|
|
|
|
constructor(name) {
|
|
this.name = name;
|
|
}
|
|
|
|
}
|
|
|
|
class Rabbit extends Animal {
|
|
constructor(name) {
|
|
*!*
|
|
super(name);
|
|
*/!*
|
|
this.created = Date.now();
|
|
}
|
|
}
|
|
|
|
*!*
|
|
let rabbit = new Rabbit("White Rabbit"); // ok now
|
|
*/!*
|
|
alert(rabbit.name); // White Rabbit
|
|
```
|