code: function (arg) {
  						if ( ! arg.allow ){
  							return;
  						}
  
  						var exist = false;
  						for (var i in data.allow) {
  							if (data.allow[i] === arg.allow) {
  								exist = true;
  							}
  						}
  						if ( exist === false ) {
  							data.allow[data.allow.length] = arg.allow;
  						}
  					}
docs: level exists, to modify this level