vue数据处理的问题

Question

如何根据数组长度对数组对象内的某个属性按照顺序赋值
比如把现在的数组的number按照顺序赋值分别变成0,1,2,3，只更改number的值，应该如何处理，感谢各位大佬

let arr = [
    {
        "id": "数据1",
        "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
        "number": 0
    },
    {
        "id": "数据2",
        "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
        "number": 1
    },
    {
        "id": "数据3",
        "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
        "number": 4
    },
    {
        "id": "数据4",
        "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
        "number": 3
    }
]

想要改成这样：
[

{
    "id": "数据1",
    "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
    "number": 0
},
{
    "id": "数据2",
    "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
    "number": 1
},
{
    "id": "数据3",
    "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
    "number": 2
},
{
    "id": "数据4",
    "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
    "number": 3
}

Answer 1

楼主看下是不是这个操作

arr.forEach((item, index) =>{
     item.number = index
})

Answer 2

arr.map((item, idx) => ({ ...item, number: idx })) ,是这个意思么？

Answer 3

我理解是将数组数据更具数组中的number排序，如下：

let arr = [
    {
        "id": "数据1",
        "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
        "number": 0
    },
    {
        "id": "数据2",
        "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
        "number": 1
    },
    {
        "id": "数据3",
        "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
        "number": 4
    },
    {
        "id": "数据4",
        "parentId": "91453e7d-11bc-443e-a2eb-c1695c4aed3f",
        "number": 3
    }
]
// 核心是这里
arr.sort((a,b)=>{
  return a.number - b.number
})

补充下：如果要倒叙就 b.number - a.number