如何按键名对对象数组进行分组？

function groupByKeyName(arr, keyName) {
  var result = {};
  
  arr.forEach(function(obj) {
    var key = obj[keyName];
    
    if (result.hasOwnProperty(key)) {
      result[key].push(obj);
    } else {
      result[key] = [obj];
    }
  });
  
  return result;
}

// 示例数据
var data = [
  { name: 'Alice', age: 25, gender: 'female' },
  { name: 'Bob', age: 30, gender: 'male' },
  { name: 'Charlie', age: 28, gender: 'male' },
  { name: 'Alice', age: 35, gender: 'female' }
];

// 按姓名进行分组
var groupedData = groupByKeyName(data, 'name');
console.log(groupedData);