C# 我想把一个球体移动到一个特定的坐标

我已经做了一个脚本，在五个轨道的五个位置移动一个球。但我希望球只能以接近的方式移动，例如，如果球在A位置，如果我按leftarrow，球将移动到左侧，如果我按rightarrow，球将移动到下一个右侧轨道。但问题是，球在五条轨道的中心，我按下向右箭头，球会移动到右边的最后一条轨道上，如果我按下向左箭头，球会移动到左边的最后一条轨道上。 我想我应该清除每个if中的按钮，我该怎么做？ 多谢各位

// Start is called before the first frame update
void Start()
{
    transform.position = targetA.position;
}

// Update is called once per frame
void Update()
{
    Movimiento();
}

void Movimiento()
{
    if (transform.position == targetA.position)
    {
        if (Input.GetKeyDown(KeyCode.LeftArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetB.position, step);
        }

        if (Input.GetKeyDown(KeyCode.RightArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetC.position, step);
        }
    }

    if (transform.position == targetB.position)
    {
        if (Input.GetKeyDown(KeyCode.LeftArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetD.position, step);
        }

        if (Input.GetKeyDown(KeyCode.RightArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetA.position, step);
        }
    }

    if (transform.position == targetC.position)
    {
        if (Input.GetKeyDown(KeyCode.LeftArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetA.position, step);
        }

        if (Input.GetKeyDown(KeyCode.RightArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetE.position, step);
        }
    }

    if (transform.position == targetD.position)
    {
        /*if (Input.GetKeyDown(KeyCode.LeftArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetE.position, step);
        }*/

        if (Input.GetKeyDown(KeyCode.RightArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetB.position, step);
        }
    }

    if (transform.position == targetE.position)
    {
        if (Input.GetKeyDown(KeyCode.LeftArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetC.position, step);
        }

        /*if (Input.GetKeyDown(KeyCode.RightArrow))
        {
            float step = speed * Time.deltaTime;
            transform.position = Vector3.MoveTowards(transform.position, targetD.position, step);
        }*/
    }
}

---

}

您只想移动一步。当您从A移动到B时，您正在输入if的代码（transform.position==targetB.position），因为您已经从A移动到B。当您完成步骤A代码时，您必须跳过B、C、D、EAnd的代码，我该如何做？使用if和Else。另一个选择是订购IF语句E、D、C、B、A。非常感谢