function AddGeolocationFieldSample()
{
    var clientContext = new SP.ClientContext();
    var targetList = clientContext.get_web().get_lists().getByTitle('[TuLista]');
    fields = targetList.get_fields();
    fields.addFieldAsXml("<Field Type='Geolocation' DisplayName='Office Location'/>",true,SP.AddFieldOptions.addToDefaultContentType);
    clientContext.load(fields);
    clientContext.executeQueryAsync(Function.createDelegate(this, this.onContextQuerySuccess), Function.createDelegate(this, this.onContextQueryFailure));
}