说明：使用Math对象的atan2方法求出鼠标光标所在位置的角度，动态改变对象的旋转位置。
源码：
this.parent.addEventListener("mouseMove",car_move);
function car_move(me:MouseEvent){
var positionX=this.mouseX-car_mc.x;
var positionY=this.mouseY-car_mc.y;
var Radin=Math.atan2(positionY,positionX);
Radin=Radin/(Math.PI/180);
car_mc.rotation=Radin;
}截图：
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