js菱形

function printDiamond(n) {
    if (n % 2 === 0) n++; // 确保n为奇数
    let mid = Math.floor(n / 2);

    for (let i = 0; i < n; i++) {
        let spaces = Math.abs(mid - i);
        let stars = n - 2 * spaces;
        console.log(' '.repeat(spaces) + '*'.repeat(stars));
    }
}

printDiamond(7);

function Base() {
    this.value = 10;
}

Base.prototype.getValue = function() {
    return this.value;
};

function DerivedA() {}
DerivedA.prototype = new Base();

function DerivedB() {}
DerivedB.prototype = new Base();

function FinalDerived() {}
FinalDerived.prototype = Object.create(DerivedA.prototype);
Object.assign(FinalDerived.prototype, DerivedB.prototype);

let instance = new FinalDerived();
console.log(instance.getValue()); // 输出10，但存在潜在问题

class Base {
    constructor() {
        this.value = 10;
    }
    getValue() {
        return this.value;
    }
}

class DerivedA extends Base {}
class DerivedB extends Base {}

class FinalDerived extends DerivedA {
    constructor() {
        super();
        Object.setPrototypeOf(this, new DerivedB());
    }
}

let instance = new FinalDerived();
console.log(instance.getValue()); // 输出10，且避免了重复创建基类实例的问题