将两个Javascript对象合并为一个具有相同键的对象

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 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 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 }

function mergeValues(target, source, key) {
  if (Array.isArray(target[key])) {
    target[key].push(...source[key]);
  } else if (isObject(target[key]) && isObject(source[key])) {
    target[key] = deepMerge({}, target[key], source[key]);
  } else {
    target[key] = [target[key], source[key]];
  }
}

function customMerge(target, ...sources) {
  sources.forEach(source => {
    Object.keys(source).forEach(key => {
      if (target.hasOwnProperty(key)) {
        mergeValues(target, source, key);
      } else {
        target[key] = source[key];
      }
    });
  });
  return target;
}

const obj1 = { a: 1, b: 2 };
const obj2 = { b: 3, c: 4 };

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