移动端,判断滑动方向

<!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>
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