如何添加两个javascript对象

function shallowMerge(obj1, obj2) {
  return { ...obj1, ...obj2 };
}

const objA = { a: 1, b: 2 };
const objB = { b: 3, c: 4 };

const mergedObj = shallowMerge(objA, objB);
console.log(mergedObj); // 输出: { a: 1, b: 3, c: 4 }

function deepMerge(target, ...sources) {
  if (!sources.length) return target;
  const source = sources.shift();

  if (isObject(target) && isObject(source)) {
    for (const key in source) {
      if (isObject(source[key])) {
        if (!target[key]) Object.assign(target, { [key]: {} });
        deepMerge(target[key], source[key]);
      } else {
        Object.assign(target, { [key]: source[key] });
      }
    }
  }

  return deepMerge(target, ...sources);
}

function isObject(item) {
  return (item && typeof item === 'object' && !Array.isArray(item));
}

const objA = { a: 1, b: { x: 2, y: 3 } };
const objB = { b: { y: 4, z: 5 }, c: 6 };

const mergedDeepObj = deepMerge({}, objA, objB);
console.log(mergedDeepObj); // 输出: { a: 1, b: { x: 2, y: 4, z: 5 }, c: 6 }