unity 3D中的无限跳跃

using UnityEngine;

public class PlayerController : MonoBehaviour
{
    public float jumpForce = 10f;
    private bool isJumping = false;
    private Rigidbody2D rb;

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

    void Update()
    {
        if (Input.GetButtonDown("Jump") && !isJumping)
        {
            Jump();
        }
    }

    void Jump()
    {
        rb.velocity = new Vector2(rb.velocity.x, jumpForce);
        isJumping = true;
    }

    void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.CompareTag("Ground"))
        {
            isJumping = false;
        }
    }
}