nl_tokens: Trigger a listener only once for an event
pl_tokens: function one ( elem , type , fn ) { if ( <mask> . isArray ( type ) ) { return _handleMultipleEvents ( one , elem , type , fn ) ; } var func = function func ( ) { off ( elem , type , func ) ; fn . apply ( this , arguments ) ; } ; // copy the guid to the new function so it can removed using the original function's ID func . guid = fn . guid = fn . guid || newGUID ( ) ; on ( elem , type , func ) ; }