如何在unity 5.6中让对象自动跳转？

using UnityEngine;

public class AutoJump : MonoBehaviour
{
    public float jumpForce = 5f; // 跳跃力度

    private Rigidbody2D rb;

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

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
        {
            Jump();
        }
    }

    private void Jump()
    {
        rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
    }
}