如何检测用户的手指何时离开元素？

Question

Now user taps the image, moves the finger away, release finger and can see the alert. Is it possible to check where user release finger and if he still on original image to show him alert? Otherwise do nothing.

Answer 1

Try this:

var touchedObject;

$('body').bind("touchstart", function(e){
    touchedObject = $(this);
});

$('body').bind("touchend", function(e){
    if (touchedObject == $(this)) {
        //show alert
    }
});