Vue中如何合并两个数组并替换指定键的值？

let arr1 = [
    { "attachment": "https://lumall.inspures.com/images/img/product/8e358701-177a-46e1-b25e-1e13fbcd92e0.png" },
    { "attachment": "https://lumall.inspures.com/images/img/product/2adcd34a-786f-43ac-b8a8-3c45ed408019.png" }
];
let arr2 = [
    { "attachment": "blob:http://localhost:8096/9b565718-7799-440b-b761-de747f2d59c5", "number": 0, "id": "" },
    { "attachment": "blob:http://localhost:8096/1d826622-bc72-466f-8778-30dcaf773489", "number": 1, "id": "" }
];

arr2 = arr2.map((item, index) => ({
    ...item,
    attachment: arr1[index].attachment
}));

[
    {
        "attachment": "https://lumall.inspures.com/images/img/product/8e358701-177a-46e1-b25e-1e13fbcd92e0.png",
        "number": 0,
        "id": ""
    },
    {
        "attachment": "https://lumall.inspures.com/images/img/product/2adcd34a-786f-43ac-b8a8-3c45ed408019.png",
        "number": 1,
        "id": ""
    }
]