在数组中按键合并相似对象

function mergeSimilarObjects(arr) {
  let mergedObj = {};
  
  arr.forEach(obj => {
    Object.entries(obj).forEach(([key, value]) => {
      if (mergedObj.hasOwnProperty(key)) {
        mergedObj[key] += value;
      } else {
        mergedObj[key] = value;
      }
    });
  });
  
  return mergedObj;
}

// 示例数据
const arr = [
  { key1: 1, key2: 2 },
  { key1: 3, key3: 4 },
  { key2: 5, key3: 6 }
];

// 调用函数进行按键合并
const mergedObject = mergeSimilarObjects(arr);

console.log(mergedObject);

{ key1: 4, key2: 7, key3: 10 }