javascript对象推入数组

Question

我是javascript的新手，我目前卡在我的javascript代码中。

我正在做的是我正在获取一个对象，并且我想将该对象推送到一个数组中，以便我可以在我的代码中的某个地方使用该数组。但每次我得到空阵。

请帮忙，下面是我的代码......

gapi.client.load('gmail', 'v1', function() {
  var thread_id_arr = [];
  listMessages(USER, '', function(resp) {
    var threads = resp;
    for (var i = 0; i < threads.length; i++) {
      var thread = threads[i];
      var thread_id = thread.threadId; //here i am getting object
      thread_id_arr.push(thread_id); // here i tried to push that object into array
      getMessage(USER, thread_id, function(res) {
        emailObject = res; // at this point also getting res as object
        emailmsgArray.push(res); // want to push object into array
      });
    }
    console.log('thread arr', thread_id_arr); //here getting blank array
    console.log('email msg arr', emailmsgArray); //here getting blank
    console.log('final msg', emailObject);

  });
  console.log('thread arr', thread_id_arr);


});

function listMessages(userId, query, callback) {
  var getPageOfMessages = function(request, result) {
    request.execute(function(resp) {
      result = result.concat(resp.messages);
      var nextPageToken = resp.nextPageToken;
      if (nextPageToken) {
        request = gapi.client.gmail.users.messages.list({
          'userId': userId,
          'pageToken': nextPageToken,
          'q': query
        });
        getPageOfMessages(request, result);
      } else {
        callback(result);
      }
    });
  };
  var initialRequest = gapi.client.gmail.users.messages.list({
    'userId': userId,
    'q': query
  });
  getPageOfMessages(initialRequest, []);
}



function getMessage(userId, messageId, callback) {
  var request = gapi.client.gmail.users.messages.get({
    'userId': userId,
    'id': messageId
  });
  request.execute(callback);
}