移动端，判断滑动方向

直接看代码：
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=0">
    <meta name="apple-mobile-web-app-capable" content="yes" />
    <title>移动端，判断滑动方向</title>
    <script src="http://apps.bdimg.com/libs/jquery/1.10.1/jquery.min.js"></script>
</head>

<body> 
    <script type="text/javascript">
		var windowHeight = $(window).height();
		$("body").css("height", windowHeight);
		var startX, startY, moveEndX, moveEndY, X, Y;
		$("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 to right");
			} else if (Math.abs(X) > Math.abs(Y) && X < 0) {
				alert("right to left");
			} else if (Math.abs(Y) > Math.abs(X) && Y > 0) {
				alert("top to bottom");
			} else if (Math.abs(Y) > Math.abs(X) && Y < 0) {
				alert("bottom to top");
			} else {
				alert("just touch");
			}
		});
    </script>
</body>

</html>