Question

我很难在下面的回复中获得用户名。如何访问用户名。我可以访问其他数据，但这

[ { “ _id”：“ 5f44d450aaa72313549d519f”， “ imageTitle”：“ uuuuu”， “ imageDesc”：“ uuuuu”， “ imageControl”：“公共”， “ imageUrl”：“ http：// localhost：3000 / uploads / image-1598346320523.jpg”， “用户身份”： { “本地”：{ “用户名”：“ uuuuu” }， “ _id”：“ 5f44d3e9aaa72313549d519e” }， “ uploadedOn”：“ 2020-08-25T09：05：20.840Z”， “ __v”：0 }

{....}

]

Answer 1

您可以这样做

var arr = JSON.parse(`

[ { "_id": "5f44d450aaa72313549d519f", "imageTitle": "uuuuu", "imageDesc": "uuuuu", "imageControl": "public", "imageUrl": "http://localhost:3000/uploads/image-1598346320523.jpg", "userId": { "local": { "username": "uuuuu" }, "_id": "5f44d3e9aaa72313549d519e" }, "uploadedOn": "2020-08-25T09:05:20.840Z", "__v": 0 },

{}

]`);
console.log(arr[0].userId.local.username);

如果您使用的是较新版本的节点（14.0.0及更高版本），则建议使用可选的链接运算符

arr[0].userId?.local?.username

从数组访问深层嵌套对象

1 个答案: