比较对象和提取深度差异

function deepEqual(obj1, obj2) {
    if (obj1 === obj2) return true;

    if (typeof obj1 !== 'object' || obj1 === null ||
        typeof obj2 !== 'object' || obj2 === null) {
        return false;
    }

    let keys1 = Object.keys(obj1);
    let keys2 = Object.keys(obj2);

    if (keys1.length !== keys2.length) return false;

    for (let key of keys1) {
        if (!keys2.includes(key) || !deepEqual(obj1[key], obj2[key])) {
            return false;
        }
    }

    return true;
}

// 示例用法
let objA = { a: 1, b: { c: 3 } };
let objB = { a: 1, b: { c: 3 } };
let objC = { a: 1, b: { c: 4 } };

console.log(deepEqual(objA, objB)); // 输出: true
console.log(deepEqual(objA, objC)); // 输出: false

function deepEqualWithCycleDetection(obj1, obj2, seen = new Map()) {
    if (obj1 === obj2) return true;

    if (typeof obj1 !== 'object' || obj1 === null ||
        typeof obj2 !== 'object' || obj2 === null) {
        return false;
    }

    if (seen.has(obj1) && seen.get(obj1) === obj2) return true;
    seen.set(obj1, obj2);

    let keys1 = Object.keys(obj1);
    let keys2 = Object.keys(obj2);

    if (keys1.length !== keys2.length) return false;

    for (let key of keys1) {
        if (!keys2.includes(key) || !deepEqualWithCycleDetection(obj1[key], obj2[key], seen)) {
            return false;
        }
    }

    return true;
}