1.  
   <script>
2.  
    
3.  
   //返回角度
4.  
   function GetSlideAngle(dx, dy) {
5.  
   returnMath.atan2(dy, dx) * 180 / Math.PI;
6.  
   }
7.  
    
8.  
   //根据起点和终点返回方向 1：向上，2：向下，3：向左，4：向右,0：未滑动
9.  
   function GetSlideDirection(startX, startY, endX, endY) {
10.  
    var dy = startY - endY;
11.  
    var dx = endX - startX;
12.  
    varresult = 0;
13.  
     
14.  
    //如果滑动距离太短
15.  
    if(Math.abs(dx) < 2 && Math.abs(dy) < 2) {
16.  
    returnresult;
17.  
    }
18.  
     
19.  
    varangle = GetSlideAngle(dx, dy);
20.  
    if(angle >= -45 && angle < 45) {
21.  
    result = 4;
22.  
    }else if (angle >= 45 && angle < 135) {
23.  
    result = 1;
24.  
    }else if (angle >= -135 && angle < -45) {
25.  
    result = 2;
26.  
    }
27.  
    else if ((angle >= 135 && angle <= 180) || (angle >= -180 && angle < -135)) {
28.  
    result = 3;
29.  
    }
30.  
     
31.  
    returnresult;
32.  
    }
33.  
     
34.  
    //滑动处理
35.  
    var startX, startY;
36.  
    document.addEventListener(‘touchstart‘,function (ev) {
37.  
    startX = ev.touches[0].pageX;
38.  
    startY = ev.touches[0].pageY;
39.  
    }, false);
40.  
    document.addEventListener(‘touchend‘,function (ev) {
41.  
    var endX, endY;
42.  
    endX = ev.changedTouches[0].pageX;
43.  
    endY = ev.changedTouches[0].pageY;
44.  
    var direction = GetSlideDirection(startX, startY, endX, endY);
45.  
    switch(direction) {
46.  
    case 0:
47.  
    alert("没滑动");
48.  
    break;
49.  
    case 1:
50.  
    alert("向上");
51.  
    break;
52.  
    case 2:
53.  
    alert("向下");
54.  
    break;
55.  
    case 3:
56.  
    alert("向左");
57.  
    alert("!");
58.  
    break;
59.  
    case 4:
60.  
    alert("向右");
61.  
    break;
62.  
    default:
63.  
    }
64.  
    }, false);
65.  
     
66.  
     
67.  
    </script>

68.  

转载：https://blog.csdn.net/iwasdream/article/details/33741859