Answers for "how to get checkbox is checked and get value"

how to take value only from the checked checkbox

document.getElementById('select').onclick = function() {
  var checkboxes = document.querySelectorAll('input[type="checkbox"]:checked');
  for (var checkbox of checkboxes) {
    document.body.append(checkbox.value + ' ');
  }
}

how to take value only from the checked checkbox

document.getElementById('select').onclick = function() {
  var checkboxes = document.getElementsByName('vechicle');
  for (var checkbox of checkboxes) {
    if (checkbox.checked)
      document.body.append(checkbox.value + ' ');
  }
}