键盘监听配合动作系统，动作只执行一次怎么解决

Creator 2.x
#1

代码如下：
const {ccclass, property} = cc._decorator;

@ccclass
export default class player extends cc.Component {
@property(cc.Node)
transtage: cc.Node = null;
// LIFE-CYCLE CALLBACKS:

onLoad () {
    cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeydown,this);
}

onDestroy(){
    cc.systemEvent.off(cc.SystemEvent.EventType.KEY_DOWN, this.onKeydown,this);
}
start () {
    cc.systemEvent.on(cc.SystemEvent.EventType.KEY_DOWN, this.onKeydown,this);
}
onKeydown(event){
    switch(event.keyCode){
        case cc.macro.KEY.left:
            this.transtage.x -= 22;
            break;
        case cc.macro.KEY.up:
            this.transtage.y += 22;
            break;
        case cc.macro.KEY.right:
            this.transtage.x += 22;
            break;
        case cc.macro.KEY.down:
            this.transtage.y -= 22;
            break;
        case cc.macro.KEY.a:
            this.span(this.transtage);
            break;
        case cc.macro.KEY.s:
            this.mirrow(this.transtage);
            break;
        case cc.macro.KEY.space:
            this.settage();
            break;
        


    }
}
// update (dt) {}
settage(){}
mirrow(node:cc.Node){
    var action = cc.flipX(true);
    node.runAction(action);
}
span(node:cc.Node){
    var action = cc.rotateTo(0.1,90);
    node.runAction(action);
}

}

测试过键盘监听一直有效，但是动作都只执行一次，是咋回事

#2

已经解决了