HTML5触摸事件(touchstart、touchmove和touchend)

http://blog.csdn.net/kaikai4/article/details/46840317
http://blog.csdn.net/fuqinyijiu/article/details/41315123
//例子
$("body").on("touchstart", function(e) {
    e.preventDefault();
    startX = e.originalEvent.changedTouches[0].pageX,
    startY = e.originalEvent.changedTouches[0].pageY;
});
$("body").on("touchmove", function(e) {
    e.preventDefault();
    moveEndX = e.originalEvent.changedTouches[0].pageX,
    moveEndY = e.originalEvent.changedTouches[0].pageY,
    X = moveEndX - startX,
    Y = moveEndY - startY;
     
    if  ( Math.abs(X) > Math.abs(Y) && X > 0 ) {
        alert("left 2 right");
    }
    else  if  ( Math.abs(X) > Math.abs(Y) && X < 0 ) {
        alert("right 2 left");
    }
    else  if  ( Math.abs(Y) > Math.abs(X) && Y > 0) {
        alert("top 2 bottom");
    }
    else  if  ( Math.abs(Y) > Math.abs(X) && Y < 0 ) {
        alert("bottom 2 top");
    }
    else{
        alert("just touch");
    }
});