写一段Unity 类似马里奥的2d移动跳跃代码

以下是一个简单的Unity类似马里奥的2D移动跳跃代码示例：

public class PlayerController : MonoBehaviour
{
    public float speed = 5.0f; // 玩家移动速度
    public float jumpForce = 10.0f; // 玩家跳跃力度
    public LayerMask groundLayer; // 用于检测地面的层级

    private Rigidbody2D rb;
    private Animator animator;
    private bool isGrounded = false;
    private float horizontalInput = 0.0f;
    private bool isJumping = false;

    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
        animator = GetComponent<Animator>();
    }

    void Update()
    {
        horizontalInput = Input.GetAxisRaw("Horizontal");

        if (Input.GetButtonDown("Jump") && isGrounded)
        {
            isJumping = true;
        }
    }

    void FixedUpdate()
    {
        // 水平移动
        rb.velocity = new Vector2(horizontalInput * speed, rb.velocity.y);

        // 检测是否在地面上
        RaycastHit2D hit = Physics2D.Raycast(transform.position, Vector2.down, 0.1f, groundLayer);
        if (hit.collider != null)
        {
            isGrounded = true;
        }
        else
        {
            isGrounded = false;
        }

        // 跳跃
        if (isJumping)
        {
            rb.velocity = new Vector2(rb.velocity.x, jumpForce);
            isJumping = false;
        }

        // 动画控制
        animator.SetFloat("Speed", Mathf.Abs(rb.velocity.x));
        animator.SetBool("IsGrounded", isGrounded);
    }
}

这个代码实现了玩家的左右移动、跳跃、动画控制以及检测是否在地面上。你可以将它附加到玩家对象上并进行测试。