Javascript 相位器：不同功能中的吐温将对象设置为未定义

我在函数调用中加入了一些精灵，如下所示：

moveSlotMachineIn() {
    var comboBaseTweenIn = this.game.add.tween(this.comboBase).to({x: 10}, 2000, "Quart.easeOut", 3000);
    var comboTopTweenIn = this.game.add.tween(this.comboTop).to({x: 10}, 2000, "Quart.easeOut", 3000);
    var comboMaskTweenIn = this.game.add.tween(this.comboMask).to({x: 10}, 2000, "Quart.easeOut", 3000);
    var arrowGrpTweenIn = this.game.add.tween(this.arrowSlotGroup).to({x: 200}, 2000, "Quart.easeOut", 3000);
  }

this.game.time.events.add(3000, this.comboLayer.moveSlotMachineOut, this);

这是可行的，在函数调用时，精灵会从左向右滑动

现在，我还要把物体滑出来。这是通过定时器完成的，因此它不会立即滑出，如下所示：

moveSlotMachineIn() {
    var comboBaseTweenIn = this.game.add.tween(this.comboBase).to({x: 10}, 2000, "Quart.easeOut", 3000);
    var comboTopTweenIn = this.game.add.tween(this.comboTop).to({x: 10}, 2000, "Quart.easeOut", 3000);
    var comboMaskTweenIn = this.game.add.tween(this.comboMask).to({x: 10}, 2000, "Quart.easeOut", 3000);
    var arrowGrpTweenIn = this.game.add.tween(this.arrowSlotGroup).to({x: 200}, 2000, "Quart.easeOut", 3000);
  }

this.game.time.events.add(3000, this.comboLayer.moveSlotMachineOut, this);

调用此函数的：

moveSlotMachineOut() {
    console.log(this.comboBase);
    var comboBaseTweenOut = this.game.add.tween(this.comboBase).to({x: 1600}, 2000, "Quart.easeOut", 3000);
    var comboTopTweenOut = this.game.add.tween(this.comboTop).to({x: 1600}, 2000, "Quart.easeOut", 3000);
    var comboMaskTweenOut = this.game.add.tween(this.comboMask).to({x: 1600}, 2000, "Quart.easeOut", 3000);
    var arrowGrpTweenOut = this.game.add.tween(this.arrowSlotGroup).to({x: 1600}, 2000, "Quart.easeOut", 3000);
  }

但由于某种原因，我得到了以下错误：

phaser.js:64795未捕获类型错误：无法读取的属性“x” 未定义

它指向moveSlotMachineOut的这个.comboBase。同样奇怪的是，所述函数中的console.log位返回undefined

下面是我对这个.comboBase的初始化：

其余的都有些相似。据我所知，我不清楚变量的值，所以我不确定发生了什么

---

是什么导致变量未定义？tweening有什么作用吗？

显然，开括号和闭括号可能意味着所有的区别

更改此选项：

this.game.time.events.add(3000, this.comboLayer.moveSlotMachineOut, this);

为此：

this.game.time.events.add(3000, this.comboLayer.moveSlotMachineOut(), this);

现在，这将创建一个完全不同的错误，因为AFAIK.add不喜欢任何带括号的内容，因此最终代码是：

this.game.time.events.add(3000, function() {this.comboLayer.moveSlotMachineOut()}, this);