Unity : 2D Game with Unity Part # 3

// โค้ดคำสั่งของ volt_controler.cs

using UnityEngine;
using System.Collections;

public class volt_controler : MonoBehaviour {
    public float jumpSpeed;
    Rigidbody2D rb;
    // Use this for initialization
    void Start () {
        rb = GetComponent ();
    }
   
    // Update is called once per frame
    void Update () {
        if (Input.GetButtonDown ("Jump")) {
            rb.velocity = new Vector2 (rb.velocity.x, jumpSpeed);
        }
    }
}