{ name: "tony", id: "1", age: "20" }, { name: "jack", id: "2", age: "21" }, { name: "tony", id: "3", age: "50" }, { name: "jack", id: "4", age: "10" }, { name: "mark", id: "5", age: "22" }, { name: "mark", id: "6", age: "40" }

要将数据中name相同的项合并成一个对象（如下）：

afterData: [
        {name: "tony",origin: [{ name: "tony", id: "1", age: "20" },{ name: "tony", id: "3", age: "50" }]},
        {name: "jack",origin: [{ name: "jack", id: "2", age: "21" },{ name: "jack", id: "4", age: "10" }]},
        {name: "mark",origin: [{ name: "mark", id: "5", age: "22" },{ name: "mark", id: "6", age: "40" }]}
实现方式很简单，记下来方便下次使用
 
let tempArr = [];
    for (let i = 0; i < this.beforeData.length; i++) {
      if (tempArr.indexOf(this.beforeData[i].name) === -1) {
        this.afterData.push({
          name: this.beforeData[i].name,
          origin: [this.beforeData[i]]
        tempArr.push(this.beforeData[i].name);
      } else {
        for (let j = 0; j < this.afterData.length; j++) {
          if (this.afterData[j].name == this.beforeData[i].name) {
            this.afterData[j].origin.push(this.beforeData[i]);
            break;
                    不知道大家在开发过程中有没有遇到这样的数据转换：数据源是这样的beforeData: [        { name: "tony", id: "1", age: "20" },        { name: "jack", id: "2", age: "21" },        { name: "tony", id: "3", age: "50" },        { na...
				
var arr = [
          {"id":"1001","name":"值1","value":"111"},
          {"id":"1001","name":"值1","value":"11111"},
          {"id":"1002","name":"值2","value":"25462"},
          {"id":"1002"...
1. 遍历数组，对于每个元素，获取需要归类的属性值。
2. 在 reduce() 方法中创建一个对象，用于保存归类后的结果。
3. 对于每个元素，检查对象中是否已经存在该属性值对应的数组，如果不存在，则创建一个新数组，并将该元素添加到数组中；如果已经存在，则将该元素添加到对应的数组中。
4. 最后，将对象中的值转换为数组，即可得到归类后的结果。
下面是一个示例代码：
```javascript
const arr = [
  { name: 'apple', type: 'fruit' },
  { name: 'banana', type: 'fruit' },
  { name: 'carrot', type: 'vegetable' },
  { name: 'orange', type: 'fruit' },
  { name: 'broccoli', type: 'vegetable' },
  { name: 'pear', type: 'fruit' },
  { name: 'tomato', type: 'vegetable' },
  { name: 'pepper', type: 'vegetable' },
  { name: 'grape', type: 'fruit' },
  { name: 'potato', type: 'vegetable' },
const result = arr.reduce((obj, item) => {
  if (obj[item.type]) {
    obj[item.type].push(item);
  } else {
    obj[item.type] = [item];
  return obj;
}, {});
console.log(result);
输出结果为：
```javascript
  fruit: [
    { name: 'apple', type: 'fruit' },
    { name: 'banana', type: 'fruit' },
    { name: 'orange', type: 'fruit' },
    { name: 'pear', type: 'fruit' },
    { name: 'grape', type: 'fruit' }
  vegetable: [
    { name: 'carrot', type: 'vegetable' },
    { name: 'broccoli', type: 'vegetable' },
    { name: 'tomato', type: 'vegetable' },
    { name: 'pepper', type: 'vegetable' },
    { name: 'potato', type: 'vegetable' }
在这个示例中，我们将 `arr` 数组中的元素按照 `type` 属性进行归类，得到一个包含 `fruit` 和 `vegetable` 两个属性的对象。每个属性对应一个数组，包含相同 `type` 属性值的元素。