一、根据数组对象中某一key值，合并相同key值的字段，到同一个数组对象中，组成新的数组

1.原数组：

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

2.合并后数组：

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

3.实现方法：

// 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);

4.测试：

二、根据数组对象中某一key值，合并相同key值的对象，到同一个对象中，组成新的数组

1.原数组：

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"}]

2.合并后数组：

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"},}]

3.实现方法一：

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);

测试：

4.实现方法二：

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)

测试：