Cristina Carrasco's questions

$('#example').DataTable({
    dom: 'Bfrtpi',
    buttons: [{
      extend: 'pdfHtml5',
      text: 'Save current page'
     }],
    columns: [
        {
            title: 'Person name',
            defaultContent: '', // if no content set in field
            data: 'name'
        },
        {
            title: 'Person age',
            type: 'num', // this would be a number field
            data: 'age'
        }
    ],
    data: [
        {name: 'John <br/> Doe', age: 25},
        {name: 'Michael <br/> Jackson', age: 30},
        {name: 'Tom Jones', age: 32},
        {name: 'Monica Beluchi', age: 34}
    ]
});

<link href="https://cdn.datatables.net/buttons/1.1.2/css/buttons.dataTables.min.css" rel="stylesheet"/>
<link href="https://cdn.datatables.net/1.10.11/css/jquery.dataTables.min.css" rel="stylesheet"/>



<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.datatables.net/1.10.11/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/buttons/1.1.2/js/dataTables.buttons.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/2.5.0/jszip.min.js"></script>
<script src="https://cdn.rawgit.com/bpampuch/pdfmake/0.1.18/build/pdfmake.min.js"></script>
<script src="https://cdn.rawgit.com/bpampuch/pdfmake/0.1.18/build/vfs_fonts.js"></script>
<script src="https://cdn.datatables.net/buttons/1.1.2/js/buttons.html5.min.js"></script>
<script src="https://cdn.datatables.net/buttons/1.0.1/js/buttons.colvis.min.js"></script>




<table id="example" class="display" cellspacing="0"></table>
<div id="r"> </div>

function funcion(){
  //alert('boton presionado');
  
  var existePropiedadFantasma = false;
  
  var equis;
  
  existePropiedadFantasma = typeof equis.propiedadFantasma !== 'undefined';//equis.propiedadFantasma ? true:false;
  
  alert(existePropiedadFantasma ? "Si existe": "No Existe");
}

<input type='button' onclick="funcion()" value='Obtener Valor'/>

$("#telefono").autoNumeric('init',{aSep: ' ', dGroup: '4', mDec: '0'});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://www.decorplanit.com/plugin/autoNumeric-1.9.41.js"></script>
Telefono [(99) 9999-9999]
<br/>
<input id="telefono" type="text"/>