一、根據數組對象中某一key值，合并相同key值的字段，到同一個數組對象中，組成新的數組

1.原數組：

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

2.合并后數組：

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

3.實現方法：

// 原始數組
var array = [{ id: 1, name: 'Alice' },{ id: 2, name: 'Bob' },{ id: 1, age: 25 },{ id: 3, name: 'Charlie', age: 30 }
];// 使用 reduce 方法合并具有相同屬性的對象
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.測試：

二、根據數組對象中某一key值，合并相同key值的對象，到同一個對象中，組成新的數組

1.原數組：

let list = [{name: "張三",gender: "張",age: "20"},{name: "李四",gender: "李",age: "25"},{name: "王五",gender: "王",age: "30"},{name: "張飛",gender: "張",age: "20"},{name: "李紅",gender: "李",age: "22"}]

2.合并后數組：

let list = [{gender: "張",{name: "張三",gender: "張",age: "20"},{name: "張飛",gender: "張",age: "20"}},{gender: "李",{name: "李四",gender: "李",age: "25"},{name: "李紅",gender: "李",age: "22"}},{gender: "王",{name: "王五",gender: "王",age: "30"},}]

3.實現方法一：

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);

測試：

4.實現方法二：

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 轉換成功的數據
console.log(newList)

測試：