如何在HTML5中获得我的手指从一个点移动到另一个点的速度（velocityX）。我在android中使用了速度（velocityX）。像这样
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){
private static final int SWIPE_MIN_DISTANCE = 30;
private static final int SWIPE_MAX_OFF_PATH = 200;
private static final int SWIPE_THRESHOLD_VELOCITY = 400;
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
// right to left swipe
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
startActivity( new Intent( this, x.class ) );
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
// Toast.makeText(getApplicationContext(), "Right Swipe", Toast.LENGTH_SHORT).show();
startActivity( new Intent( this , aasas.class) );
}
else if(e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
} else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
}
} catch (Exception e) {
// nothing
}
return true;
}
我希望在html5中实现相同的功能，但是我无法获得velocityX和我的html5代码就是这个
this.downX = null;
this.upX = null;
document.body.addEventListener('touchstart', function(event) {
event.preventDefault();
console.log("movvv");
this.downX = event.touches[0].pageX;
}, true);
document.body.addEventListener('touchmove', function(event) {
event.preventDefault();
this.upX = event.touches[0].pageX;
}, true);
document.body.addEventListener('touchend', function(event) {
event.preventDefault();
if ((this.downX - this.upX) > 50) {
console.log("goooo");
}
if ((this.upX - this.downX) > 50) {
}
}, true);
其实我想把这行Android改为Html5
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
如果有任何PLZ指南，如果HTML5中的单个Touch有任何功能，如Android onSingleTapUp