code: function(name, action) {
          var handlers = this.__handlers__;
  
          if (! handlers ||
              ! handlers[name]) {
              return false;
          }
          var hdls = handlers[name];
          for (var i = 0; i < hdls.length; i++) {
              if (hdls[i].action === action) {
                  return true;
              }
          }
      }
docs: If registered the event handler
  @param  {string}  name
  @param  {Function}  action
  @return {boolean}