jump2dan.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class jump2dan : MonoBehaviour
{
	int jumpCount = 0;
	public Rigidbody rb;

	void Update()
	{
		if (jumpCount < 2 && Input.GetKeyDown(KeyCode.Space))
		{
			rb.velocity = Vector3.zero;
			rb.AddForce(0f,300f,0f);
			jumpCount++;
		}

	}

	private void OnCollisionEnter(Collision collision)
	{
		if (collision.gameObject.name == "groud")
		{
			jumpCount = 0;
		}
	}
}

//参考；https://stepism.sakura.ne.jp/unity/wiki/doku.php?id=wiki:unity:tips:069