我不知道天气或不使用时间。deltaTime我认为这将是很好的实现它，但我不知道如何，我已经尝试过，但我搞砸了一些东西

using UnityEngine;
using UnityEngine.SceneManagement;

public class PlayerMovement : MonoBehaviour
{
    [SerializeField] private float horSpeed;
    [SerializeField] private float vertSpeed;
    private Rigidbody2D rb;
    private bool isJumping;

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

    private void Update()
    {
        // we store the initial velocity, which is a struct.
        var v = rb.velocity;

        

        if (Input.GetKey(KeyCode.Space) && !isJumping)
        {
            v.y = vertSpeed * Time.deltaTime;
            isJumping = true;
        }

        if (Input.GetKey(KeyCode.A))
            v.x = -horSpeed * Time.deltaTime;

        if (Input.GetKey(KeyCode.D))
            v.x = horSpeed * Time.deltaTime;

        if (Input.GetKey(KeyCode.S))
            v.y = -vertSpeed * Time.deltaTime;

        rb.velocity = v;

        if(Input.GetKey(KeyCode.Escape))
            SceneManager.LoadScene(0);
    }

    private void OnCollisionEnter2D(Collision2D collision)
    {
        isJumping = false;
    }

}

当我试图添加它时，我的角色只是移动得非常慢