摘要： override func viewDidLoad() { super.viewDidLoad() var swipeRight = UISwipeGestureRecognizer(target: self, action: "respondToSwipeGesture:") s... 阅读全文

摘要： http://stackoverflow.com/questions/6429225/javascript-null-or-undefinedvar x;x == null // truex == undefined // truex === null ... 阅读全文