JavaScript合并数组对象：按Key值合并字段与分组的两种实现方案

var array = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 1, age: 25 },
  { id: 3, name: 'Charlie', age: 30 }
];

var array = [
  { id: 1, name: 'Alice'， age: 25  },
  { id: 2, name: 'Bob' },
  { id: 3, name: 'Charlie', age: 30 }
];

// 原始数组
var array = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 1, age: 25 },
  { id: 3, name: 'Charlie', age: 30 }
];

// 使用 reduce 方法合并具有相同属性的对象
var mergedArray = array.reduce(function(result, obj) {
  var target = result.find(function(item) {
    return item.id === obj.id;
  });

  if (target) {
    Object.assign(target, obj);
  } else {
    result.push(obj);
  }

  return result;
}, []);

console.log(mergedArray);

let list = [
      {
        name: "张三",
        gender: "张",
        age: "20"
      },
      {
        name: "李四",
        gender: "李",
        age: "25"
      },
      {
        name: "王五",
        gender: "王",
        age: "30"
      },
      {
        name: "张飞",
        gender: "张",
        age: "20"
      },
      {
        name: "李红",
        gender: "李",
        age: "22"
      }
    ]

let list = [
	{
	  gender: "张",
	  {
        name: "张三",
        gender: "张",
        age: "20"
      },
      {
        name: "张飞",
        gender: "张",
        age: "20"
      }
	},
	{
	 gender: "李",
	 {
        name: "李四",
        gender: "李",
        age: "25"
      },
       {
        name: "李红",
        gender: "李",
        age: "22"
      }
    },
    {
    	gender: "王",
    	{
        name: "王五",
        gender: "王",
        age: "30"
      },
    }
  ]

let tempArr = [];
let Data = [];
for (let i = 0; i < list.length; i++) {
   if (tempArr.indexOf(list[i].gender) === -1) {
     Data.push({
       gender: list[i].gender,
       dataInfo: [list[i]]
     });
     tempArr.push(list[i].gender);
   } else {
     for (let j = 0; j < Data.length; j++) {
       if (Data[j].gender== list[i].gender) {
         Data[j].dataInfo.push(list[i]);
         break;
       }
     }
   }
 }
 console.log(Data);

let dataInfo = {};
list.forEach((item, index) => {
	let { gender } = item;
	if (!dataInfo[gender]) {
		dataInfo[gender] = {
			gender,			
			child: []
		}
	}
	dataInfo[gender].child.push(item);
});
let newList = Object.values(dataInfo); // list 转换成功的数据
console.log(newList)