js中extend调用方法

function extend(child, parent) {
    child.prototype = Object.create(parent.prototype);
    child.prototype.constructor = child;
}

// 使用示例
function Parent() {
    this.name = 'Parent';
}

Parent.prototype.sayHello = function() {
    console.log('Hello, I am ' + this.name);
};

function Child() {
    Parent.call(this); // 调用父类构造函数，继承属性
    this.name = 'Child'; // 覆盖父类的属性
}

extend(Child, Parent); // 继承方法

const childInstance = new Child();
childInstance.sayHello(); // 输出: Hello, I am Child

function deepExtend(child, parent) {
    child.prototype = Object.create(parent.prototype);
    child.prototype.constructor = child;
    for (let key in parent.prototype) {
        if (typeof parent.prototype[key] === 'object' && parent.prototype[key] !== null) {
            child.prototype[key] = JSON.parse(JSON.stringify(parent.prototype[key]));
        }
    }
}

// 使用深拷贝继承...