$.ajax({
    ...,
    data: { parametro: [1, 2, 3, 4] },
    ....
}

@media (max-device-width:640px) and (orientation:landscape){
     .container{
 width:538px;
     }
}

function claves(id, time) {
    this.id = id;
    this.time = time;
}

key_cadaTecla.push(new claves(event.keyCode,tiempoPulsacion));

[{id: a, time: 1}, {id: a, time: 2}, {id: b, time: 1}]

const obj = [{id: 'a', time: 1}, {id: 'a', time: 2}, {id: 'b', time: 1}];
 
const objMapped = obj.reduce((array, item) => {
  let { id, time } = item;
 
  if (!array[id])
    array[id] = [];
 
  array[id].push(time);
  return array;
 
}, []);
 
console.log(objMapped);

if (!is_special_key(event.keyCode)) {

<div class="col-xs-12 col-sm-10 col-md-7 col-lg-5"></div>