How to calculate sliding distance using touch event on JS mobile phone

This article mainly introduces the method of calculating the sliding distance by the touch event on the JS mobile phone. It analyzes the related operation skills of JavaScript in response to the touch event on the mobile phone screen to calculate the sliding distance. Friends in need can refer to it. I hope it can help. Everyone.

Calculate the distance the gesture slides when it slides on the mobile phone screen. The code is as follows:

function wetherScroll(){
    var startX = startY = endX =endY =0;
    var body=document.getElementsByTagName("body");
    body.bind('touchstart',function(event){
      var touch = event.targetTouches[0];
      //滑动起点的坐标
      startX = touch.pageX;
      startY = touch.pageY;
      // console.log("startX:"+startX+","+"startY:"+startY);
    });
    body.bind("touchmove",function(event){
      var touch = event.targetTouches[0];
      //手势滑动时，手势坐标不断变化，取最后一点的坐标为最终的终点坐标
        endX = touch.pageX;
        endY = touch.pageY;
        // console.log("endX:"+endX+","+"endY:"+endY);
    })
    body.bind("touchend",function(event){
      var distanceX=endX-startX,
        distanceY=endY - startY;
        // console.log("distanceX:"+distanceX+","+"distanceY:"+distanceY);
        //移动端设备的屏幕宽度
        var clientHeight; =document.documentElement.clientHeight;
        // console.log(clientHeight;*0.2);
        //判断是否滑动了，而不是屏幕上单击了
        if(startY!=Math.abs(distanceY)){
 //在滑动的距离超过屏幕高度的20%时，做某种操作
          if(Math.abs(distanceY)>clientHeight*0.2){
 //向下滑实行函数someAction1，向上滑实行函数someAction2
          distanceY <0 ? someAction1():someAction2();
        }
        }
        startX = startY = endX =endY =0;
    })
}

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