touch事件如何获取滑动距离长度

计算手势在手机屏幕上滑动时，手势滑动的距离，代码如下：

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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