使用唯一键更新Javascript对象的嵌套值

Question

我想在每个子注释中添加唯一的id ，注释可能有100多个，我将此对象作为输入，并且必须添加自动增量并插入数据库中，任何帮助将不胜感激。

我想更新这个object

var objData =   {"comments":{
        "commentedBy" : "jaril1",
        "date" : "",
        "comment" : "Hello world",
        "subComments" : {
            "commentedBy" : "jaril 2",
            "date" : "",
            "comment" : "Hello world inside dark",
            "subComments" :{
                "commentedBy": "jaril 3",
                "date": "",
                "comment": "wow working great"
            }
        }
    }
}

对此：

var objData =   {"comments":{
        "commentId":1,
        "commentedBy" : "jaril1",
        "date" : "",
        "comment" : "Hello world",
        "subComments" : {
            "commentId":2,
            "commentedBy" : "jaril 2",
            "date" : "",
            "comment" : "Hello world inside dark",
            "subComments" :{
                "commentId":3,
                "commentedBy": "jaril 3",
                "date": "",
                "comment": "wow working great"
            }
        }
    }
}

Answer 1

 var objData = {"comments":{"commentedBy":"jaril1","date":"","comment":"Hello world","subComments":{"commentedBy":"jaril 2","date":"","comment":"Hello world inside dark","subComments":{"commentedBy":"jaril 3","date":"","comment":"wow working great"}}}} var id=1 function updateComment(commenObj){ return commenObj.subComments ? {...commenObj, commentId: id++, subComments: updateComment(commenObj.subComments)} : {...commenObj, commentId: id++} } console.log(updateComment(objData.comments)) 

Answer 2

如果没有为增量没有额外的要求，你可以因为你的数据结构是递归的递归做到这一点。

您定义一个递归函数，如withId_ ，该函数接受一个对象和id，递增id，然后在subComments属性（如果存在）上调用自身：

 const objData ={"comments":{ "commentedBy" : "jaril1", "date" : "", "comment" : "Hello world", "subComments" : { "commentedBy" : "jaril 2", "date" : "", "comment" : "Hello world inside dark", "subComments" :{ "commentedBy": "jaril 3", "date": "", "comment": "wow working great" } } } } const withId_ = ({ commentedBy, date, comment, subComments }, id) => { if (typeof subComments === 'undefined') { return { commentId: id + 1, commentedBy, date, comment }; } else { let incrementedId = id + 1; return { commentId: incrementedId, commentedBy, date, comment, subComments: withId_(subComments, incrementedId) }; } }; const withId = (objectData) => withId_(objectData.comments, 0); console.log(withId(objData)); 

输出：

{
    "commentId": 1,
    "commentedBy": "jaril1",
    "date": "",
    "comment": "Hello world",
    "subComments": {
        "commentId": 2,
        "commentedBy": "jaril 2",
        "date": "",
        "comment": "Hello world inside dark",
        "subComments": {
            "commentId": 3,
            "commentedBy": "jaril 3",
            "date": "",
            "comment": "wow working great"
        }
    }
}

Answer 3

  const objData = {"comments":{ "commentedBy" : "jaril1", "date" : "", "comment" : "Hello world", "subComments" : { "commentedBy" : "jaril 2", "date" : "", "comment" : "Hello world inside dark", "subComments" :{ "commentedBy": "jaril 3", "date": "", "comment": "wow working great" } } } } let id = 1; function addId(obj) { obj.commentId = id++; if (obj.subComments) { addId(obj.subComments); } } addId(objData.comments); console.log(objData); 

不管有多少子注释，这都会为每个注释添加commentId。

Answer 4

var objData =   {"comments":{
     "commentedBy" : "jaril1",
     "date" : "",
     "comment" : "Hello world",
     "subComments" : {
         "commentedBy" : "jaril 2",
         "date" : "",
         "comment" : "Hello world inside dark",
         "subComments" :{
             "commentedBy": "jaril 3",
             "date": "",
             "comment": "wow working great"
         }
     }
 } };

 var Id = 1;
 objData.commentId = Id;

 function addCommentId(comments) {
    if (comments.subComments) {
      comments.subComments.commentId = Id++;
      addCommentId(comments.subComments);
    } 
    return comments;
 }

 var data = addCommentId(objData);
 console.log(data);