按2个动态键对数组排序

const students = [
    { name: 'Alice', age: 20, score: 85 },
    { name: 'Bob', age: 22, score: 90 },
    { name: 'Charlie', age: 20, score: 95 },
    { name: 'David', age: 22, score: 88 }
];

students.sort((a, b) => {
    if (a.age !== b.age) {
        return a.age - b.age; // 按年龄升序
    } else {
        return b.score - a.score; // 年龄相同，按分数降序
    }
});

console.log(students);

students.sort((a, b) => {
    if (a.age === undefined || b.age === undefined) return 0;
    if (a.age !== b.age) {
        return a.age - b.age;
    } else {
        if (a.score === undefined || b.score === undefined) return 0;
        return b.score - a.score;
    }
});