Photo by Mohammad Rahmani on Unsplash
函式方法
| 变数 |
说明 |
| constructor |
建构子 |
| super |
上层类别 |
| instanceof |
判断是类为指定类别 |
建立类别
class Animal {
constructor(name, color){
this.name = name
this.color = color
}
sayHi(){
console.log(`[Animal] My name is「${this.name}」 My color is 「${this.color}」`);
}
}
const animal = new Animal('Dog','white');
// [Animal] My name is「Dog」 My color is 「white」
animal.sayHi()
继承类别
class Cat extends Animal {
sayHi() {
console.log(`[Cat] My name is「${this.name}」 My color is 「${this.color}」`);
}
}
const KittyCat = new Cat('Kitty', 'pink');
// [Cat] My name is「Kitty」 My color is 「pink」
KittyCat.sayHi();
呼叫父类别方法
class Cat extends Animal {
sayHi() {
console.log(`[Cat] My name is「${this.name}」 My color is 「${this.color}」`);
super.sayHi();
}
}
const KittyCat = new Cat('Kitty', 'pink')
// [Cat] My name is「Kitty」 My color is 「pink」
// [Animal] My name is「Kitty」 My color is 「pink」
KittyCat.sayHi();
判断是类为指定类别
console.log(KittyCat instanceof Cat) // true
console.log(KittyCat instanceof Animal) // true
Reference
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