为什么玩家游戏对象在没有按下移动键的情况下仍继续在半空中移动？

Question

我正在 Unity 中制作一个 2D 游戏，玩家可以向左或向右跳跃和行走。玩家应该能够在半空中改变方向，但问题是，尽管不再按移动键，但他们仍继续朝跳跃时移动的方向移动。

这是运动脚本：

public float jumpHeight;

public float speed;

public Rigidbody2D rb;

private bool isGrounded;

public Transform feetPos;

public float checkRadius;

public LayerMask Ground;

private float jumpTimeCounter;

public float jumpTime;

private bool isJumping;

void Update()
{
    PausedThisFrame = false;

    isGrounded = Physics2D.OverlapCircle(feetPos.position, checkRadius, Ground);

    if (isGrounded && Input.GetKeyDown(KeyCode.Space))
    {
        isJumping = true;
        jumpTimeCounter = jumpTime;
        rb.velocity = Vector2.up * jumpHeight;
    }
    if (Input.GetKey(KeyCode.Space) && isJumping)
    {
        if (jumpTimeCounter > 0)
        {
            rb.velocity = Vector2.up * jumpHeight;
            jumpTimeCounter -= Time.deltaTime;
        }
        else
        {
            isJumping = false;
        }
    }
    if (Input.GetKeyUp(KeyCode.Space))
    {
        isJumping = false;
    }
}

void FixedUpdate()
{
    if (Input.GetKey(KeyCode.A))
    {
        Debug.Log("A");
        rb.velocity = new Vector2(-1 * speed, rb.velocity.y);
        transform.eulerAngles = new Vector3(0, 180, 0);
    }
    if (Input.GetKey(KeyCode.D))
    {
        Debug.Log("D");
        rb.velocity = new Vector2(1 * speed, rb.velocity.y);
        transform.eulerAngles = new Vector3(0, 0, 0);
    }
    else
    {
        rb.velocity = new Vector2(rb.velocity.x, rb.velocity.y);
    }
}

我尝试调试代码以查看脚本是否认为按键被按下，但即使脚本也知道它们没有被按下，所以我真的不知道是什么改变了刚体的速度。

Answer 1

else
    {
        rb.velocity = new Vector2(0, rb.velocity.y);
    }

将水平速度设置为零