function wetherScroll(){    var startX = startY = endX =endY =0;    var body=document.getElementsByTagName("body");    body.bind('touchstart',function(event){      var touch = event.targetTouches[0];      //滑動(dòng)起點(diǎn)的坐標(biāo)      startX = touch.pageX;      startY = touch.pageY;      // console.log("startX:"+startX+","+"startY:"+startY);    });    body.bind("touchmove",function(event){      var touch = event.targetTouches[0];      //手勢(shì)滑動(dòng)時(shí)，手勢(shì)坐標(biāo)不斷變化，取最后一點(diǎn)的坐標(biāo)為最終的終點(diǎn)坐標(biāo)        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);        //移動(dòng)端設(shè)備的屏幕寬度        var clientHeight; =document.documentElement.clientHeight;        // console.log(clientHeight;*0.2);        //判斷是否滑動(dòng)了，而不是屏幕上單擊了        if(startY!=Math.abs(distanceY)){ //在滑動(dòng)的距離超過(guò)屏幕高度的20%時(shí)，做某種操作          if(Math.abs(distanceY)>clientHeight*0.2){ //向下滑實(shí)行函數(shù)someAction1，向上滑實(shí)行函數(shù)someAction2          distanceY <0 ? someAction1():someAction2();        }        }        startX = startY = endX =endY =0;    })}