为json对象中的每个条目添加唯一的ID

Question

我有一个json对象，如下所示：

我想要为每个具有属性title条目添加唯一的ID，因此我的json对象将如下所示：

在另一个版本中，我想为每个条目添加一个唯一的ID，因此它看起来像这样：

我怎样才能做到这一点 ？

编辑：

这是我的json对象： https : //api.myjson.com/bins/59prd

Answer 1

您可以使用for...in遍历对象并添加唯一标识符。

var iterator = 0; // this is going to be your identifier

function addIdentifier(target){
  target.id = iterator;
  iterator++;
}

function loop(obj){

  for(var i in obj){

    var c = obj[i];        

    if(typeof c === 'object'){

      if(c.length === undefined){

        //c is not an array
        addIdentifier(c);

      }

      loop(c);

    }

  }

}

loop(json); // json is your input object

Answer 2

您可以对回调使用闭包addId来迭代数组，而对嵌套数组使用内部回调iter 。

通过调用addId ，您可以指定一个索引开头。

 function addId(id) { return function iter(o) { if ('title' in o) { o.id = id++; } Object.keys(o).forEach(function (k) { Array.isArray(o[k]) && o[k].forEach(iter); }); }; } var data = [{ "Arts": [{ "Performing arts": [{ "Music": [{ "title": "Accompanying" }, { "title": "Chamber music" }, { "title": "Church music" }, { "Conducting": [{ "title": "Choral conducting" }, { "title": "Orchestral conducting" }, { "title": "Wind ensemble conducting" }] }, { "title": "Early music" }, { "title": "Jazz studies" }, { "title": "Musical composition" }, { "title": "Music education" }, { "title": "Music history" }, { "Musicology": [{ "title": "Historical musicology" }, { "title": "Systematic musicology" }] }, { "title": "Ethnomusicology" }, { "title": "Music theory" }, { "title": "Orchestral studies" }, { "Organology": [{ "title": "Organ and historical keyboards" }, { "title": "Piano" }, { "title": "Strings, harp, oud, and guitar" }, { "title": "Singing" }, { "title": "Strings, harp, oud, and guitar" }] }, { "title": "Recording" }] }, { "Dance": [{ "title": "Choreography" }, { "title": "Dance notation" }, { "title": "Ethnochoreology" }, { "title": "History of dance" }] }, { "Television": [{ "title": "Television studies" }] }, { "Theatre": [{ "title": "Acting" }, { "title": "Directing" }, { "title": "Dramaturgy" }, { "title": "History" }, { "title": "Musical theatre" }, { "title": "Playwrighting" }, { "title": "Puppetry" }] }] }] }]; data.forEach(addId(1)) console.log(data); 

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