如何合并通过值求和的哈希数组？

function mergeHashArray(hashArray) {
  var result = {};
  
  for (var i = 0; i < hashArray.length; i++) {
    var currentHash = hashArray[i];
    
    for (var key in currentHash) {
      if (result.hasOwnProperty(key)) {
        result[key] += currentHash[key];
      } else {
        result[key] = currentHash[key];
      }
    }
  }
  
  return result;
}

// 示例用法
var hashArray = [
  { "a": 1, "b": 2 },
  { "a": 3, "c": 4 },
  { "b": 5, "c": 6 }
];

var mergedHash = mergeHashArray(hashArray);
console.log(mergedHash);

{ "a": 4, "b": 7, "c": 10 }