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刷卡的角度，我有以下代码：如何从JavaScript的触摸事件
swipeDetect = function(el, callback){
var touchsurface = el,
swipedir,
startX,
startY,
distX,
distY,
threshold = 7, //required min distance traveled to be considered swipe
restraint = 100, // maximum distance allowed at the same time in perpendicular direction
allowedTime = 500, // maximum time allowed to travel that distance
maxangle=40,
elapsedTime,
startTime,
touchinprocess=false,
handleswipe = callback || function(swipedir){};
touchsurface.addEventListener('touchstart', function(e){
touchinprogress = true;
var touchobj = e.changedTouches[0];
swipedir = 'none';
dist = 0;
startX = touchobj.pageX;
startY = touchobj.pageY;
startTime = new Date().getTime();
}, false);
touchsurface.addEventListener('touchmove', function(e){
var touchobj = e.changedTouches[0];
distX = startX - touchobj.pageX;
distY = startY - touchobj.pageY;
rads = Math.atan(distY,distX);
var deg = rads * (180/3.14);
console.log(deg);
if (Math.abs(distY) > restraint && Math.abs(deg) > maxangle) e.preventDefault();
}, false);
touchsurface.addEventListener('touchend', function(e){
var touchobj = e.changedTouches[0];
distX = touchobj.pageX - startX;
distY = touchobj.pageY - startY;
elapsedTime = new Date().getTime() - startTime;
if (elapsedTime <= allowedTime){ // first condition for awipe met
if (Math.abs(distX) >= threshold && Math.abs(distY) <= restraint){ // 2nd condition for horizontal swipe met
swipedir = (distX < 0)? 'left' : 'right'; // if dist traveled is negative, it indicates left swipe
}
else if (Math.abs(distY) >= threshold && Math.abs(distX) <= restraint){ // 2nd condition for vertical swipe met
swipedir = (distY < 0)? 'up' : 'down'; // if dist traveled is negative, it indicates up swipe
};
};
handleswipe(e,swipedir);
return true;
}, false);
},
我试图让度的触摸移动功能的触摸滑动的角度（并杀死默认如果滑动超过特定数量的度数，则滚动）。但它一直输出80左右的数字。不管我怎么刷卡。这里有什么问题？
我使用这个图像刷卡，我想让用户刷卡，并没有它滚动和同时刷卡。
也许我正在谈论这一切都是错误的。
感谢您的帮助。