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
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' },
javascript数组对象
{ 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

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