类与继承

class extends constructor static super get/set

{
    // 基本定义和生成实例
    class Parent {
        constructor(name = "wcd") {
            this.name = name;
        }
    }
    let v_parent = new Parent("v");
    console.log("构造函数和实例", v_parent); // 构造函数和实例 Parent { name: 'v' }
}
{
    // 继承
    class Parent {
        constructor(name = "wcd") {
            this.name = name;
        }
    }
    class Child extends Parent {}
    console.log("继承", new Child()); // 继承 Child { name: 'wcd' }
}
{
    // 继承传递参数
    class Parent {
        constructor(name = "wcd") {
            this.name = name;
        }
    }
    class Child extends Parent {
        constructor(name = "child") {
            super(name);
            this.type = "child";
        }
    }
    console.log("继承传递参数", new Child("hello")); // 继承传递参数 Child { name: 'hello', type: 'child' }
}
{
    // getter, setter
    class Parent {
        constructor(name = "wcd") {
            this.name = name;
        }
        // 这里是属性，不是方法
        get longName() {
            return "yx" + this.name;
        }
        set longName(value) {
            this.name = value;
        }
    }
    let v = new Parent();
    console.log("getter", v.longName); // getter yxwcd
    v.longName = "hello";
    console.log("setter", v.longName); // setter yxhello
}
{
  // 静态方法，不能在类的实例上调用静态方法，而应该通过类本身调用
    class Parent {
        constructor(name = "wcd") {
            this.name = name;
        }
        static tell() {
            console.log("tell"); // tell
        }
    }
    Parent.tell();
}
{
    // 静态属性
    class Parent {
        constructor(name = "wcd") {
            this.name = name;
        }
        static tell() {
            console.log("tell");
        }
    }
    Parent.type = "test";
    console.log("静态属性", Parent.type); // 静态属性 test
}