js 合并对象

const obj1 = { a: 1, b: 2 };
const obj2 = { b: 3, c: 4 };
const mergedObj = Object.assign({}, obj1, obj2);
console.log(mergedObj); // 输出: { a: 1, b: 3, c: 4 }

const obj1 = { a: 1, b: 2 };
const obj2 = { b: 3, c: 4 };
const mergedObj = { ...obj1, ...obj2 };
console.log(mergedObj); // 输出: { a: 1, b: 3, c: 4 }

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

function deepMerge(target, source) {
  const output = { ...target };
  if (isObject(target) && isObject(source)) {
    Object.keys(source).forEach(key => {
      if (isObject(source[key])) {
        if (!(key in target)) {
          Object.assign(output, { [key]: source[key] });
        } else {
          output[key] = deepMerge(target[key], source[key]);
        }
      } else {
        Object.assign(output, { [key]: source[key] });
      }
    });
  }
  return output;
}

const obj1 = { a: 1, b: { c: 2 } };
const obj2 = { b: { d: 3 }, e: 4 };
const mergedObj = deepMerge(obj1, obj2);
console.log(mergedObj); // 输出: { a: 1, b: { c: 2, d: 3 }, e: 4 }