代码示例：（标识：jsck_class_extends）
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript 类继承</h2>
<p>使用 “extends” 关键字从另一个类继承所有方法。</p>
<p>使用 “super” 方法调用父级的构造函数。</p>
<p id="demo"></p>
<script>
class Car {
constructor(brand) {
this.carname = brand;
}
present() {
return 'I have a ' + this.carname;
}
}
class Model extends Car {
constructor(brand, mod) {
super(brand);
this.model = mod;
}
show() {
return this.present() + ', it is a ' + this.model;
}
}
mycar = new Model("Tesla", "Model3");
document.getElementById("demo").innerHTML = mycar.show();
</script>
</body>
</html>
