import flash.events.MouseEvent;

var odx:Number=mouseX;

var ody:Number=mouseY;

stage.addEventListener(MouseEvent.MOUSE_DOWN,onMouseDown_func)

stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp_func);

function onMouseDown_func(_evt:MouseEvent):void{

    stage.addEventListener(MouseEvent.MOUSE_MOVE, onMove);

}

function onMouseUp_func(_evt:MouseEvent):void{

    stage.removeEventListener(MouseEvent.MOUSE_MOVE, onMove);

}

function onMove(e:MouseEvent):void{

    var newx:Number=mouseX;

    var newy:Number=mouseY;

    if(newx>odx)trace("鼠标在右移")else trace("鼠标在左移")

    if(newy>ody)trace("鼠标在下移")else trace("鼠标在上移")

    odx=newx;

    ody=newy;

}