if (N == 1) {
            if (this._y<150) {
                this._x -= guaiwu_xmove;
                this._y += guaiwu_ymove;
            } else {
                this._x += guaiwu_xmove;
                this._y += guaiwu_ymove;
            }
        }
如果需要怪物斜着从下方飞进,斜着从上方飞出，并且设定它的代号为2，即N==2那么我的代码是这么写的：                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Flash射击游戏设计+需求分析(10):http://www.751com.cn/jisuanji/lunwen_464.html