这个小球 还时在不同的旋转中 

class Ball extends Laya.Sprite{    private static cached:boolean = false;    private body:Laya.Sprite;    constructor(){        super();        this.init();    }    public init():void{        if(!Ball.cached){            Ball.cached = true;            this.body = new Laya.Sprite();            this.body.loadImage("war/ball.png");            this.body.pivot(12,12);        }        this.addChild(this.body);        Laya.timer.frameLoop(1,this,this.animate);        }    private animate(e):void{		this.body.rotation += 10;	}}

 首先计算出 小球和鼠标之间的角度. 然后根据角度 计算出下一个坐标点的位置

class Main{    private ball:Ball;    private speed:number = 5;    constructor()    {			Laya.init(1100, 619, Laya.WebGL);            Laya.loader.load("res/atlas/war.atlas",Laya.Handler.create(this,this.onLoaded),null,Laya.Loader.ATLAS);    }    private onLoaded():void{            this.ball = new Ball();            Laya.stage.addChild(this.ball);		    this.ball.x = Laya.stage.width / 2;		    this.ball.y = Laya.stage.height / 2;                        Laya.timer.frameLoop(1,this,this.onEnterFrame);    }    private onEnterFrame():void{        //计算出角度        let dx:number = Laya.stage.mouseX - this.ball.x;        let dy:number = Laya.stage.mouseY - this.ball.y;        let angle:number = Math.atan2(dy,dx);  //弧度制        console.info(angle);                 //可以根据弧度旋转 这个例子不需要 因为小球自己是不停转动的        //this.ball.rotation = angle;        //根据弧度 计算出目标点坐标        this.ball.x += Math.cos(angle)*this.speed;        this.ball.y += Math.sin(angle)*this.speed;    }}new Main();