Javascript对象数组根据其中某一个相同的对象属性进行重新分类

类

话不多说上代码

这这个demo⾥ 我们根据hobby进⾏分类 筛选出mj 组成新的对象数组

var huaji = [{ name: 'a', hobby: '1', mj: '12' }, { name: 'a', hobby: '2', mj: '13' }, { name: 'a', hobby: '3', mj: '14' }, { name: 'a', hobby: '4', mj: '15' }, { name: 'a', hobby: '5', mj: '162' }, { name: 'a', hobby: '6', mj: '15' }, { name: 'q', hobby: '1', mj: '13' }, { name: 'q', hobby: '2', mj: '16' }, { name: 'q', hobby: '3', mj: '17' }, { name: 'q', hobby: '4', mj: '19' }, { name: 'q', hobby: '5', mj: '16' }, { name: 'x', hobby: '1', mj: '13' }, { name: 'x', hobby: '2', mj: '13' }, { name: 'x', hobby: '3', mj: '16' }, { name: 'x', hobby: '4', mj: '17' }]

let tempArr = []; var newArr = [];

for (let i = 0; i < huaji.length; i++) {

if (tempArr.indexOf(huaji[i].hobby) === -1) { newArr.push({

hobby: huaji[i].hobby, mj: [huaji[i].mj] });

tempArr.push(huaji[i].hobby); } else {

for (let j = 0; j < newArr.length; j++) { if (newArr[j].hobby == huaji[i].hobby) { newArr[j].mj.push(huaji[i].mj); break; } } } }

console.log(newArr)；

// 优化版本-------------------------------

let tempArr = [];var newArr = [];

huaji.forEach((i, index) => {

　　if (tempArr.indexOf(i.hobby) === -1) {　　　　　newArr.push({　　　　　　hobby: i.hobby,　　　　　　mj: [i.mj]　　　　});

　　　　tempArr.push(i.hobby);　　} else {

　　　　newArr[tempArr.indexOf(i.hobby)].mj.push(i.mj)　　}});

console.log(newArr)

效果如下