valid card number

validNumber.js

input.addEventListener('input', function() {
  var _arrValue = [];
  var _value = this.value.replace(/\D/gi, '');
  
  if(_value.length > 16) {
    _value = _value.substr(0,16)
  }
  
  for(let i = 0; i < _value.length; i+=4) {
    _arrValue.push(_value.substr(i, 4));
  }

  this.value = _arrValue.join('-')
})