JavaScript检测鼠标移动方向的方法

function Start() {

  stage.addEventListener(MouseEvent.MOUSE_MOVE, CheckDirection);

}

Start();

var prevX=0;

var prevY=0;

var curX=0;

var curY=0;

 

var dirX:String="";

var dirY:String="";

function CheckDirection(e:MouseEvent) {

  trace("X movement: " + GetHorizontalDirection() + ", Y movement: " + GetVerticalDirection());

  e.updateAfterEvent();

}

function GetHorizontalDirection():String {

  prevX=curX;

  curX=stage.mouseX;

  if (prevX>curX) {

    dirX="left";

  } else if (prevX < curX) {

    dirX="right";

  } else {

    dirX="none";

  }

  return dirX;

}

function GetVerticalDirection():String {

  prevY=curY;

  curY=stage.mouseY;

  if (prevY>curY) {

    dirY="up";

  } else if (prevY < curY) {

    dirY="down";

  } else {

    dirY="none";

  }

  return dirY;

}