I have issue with jumping. My character jump when I use D key. Can someone help me please?

Questions & Answers
1

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

public class PlayerMovement : MonoBehaviour
{
//movement
public float speed;

public float jump;

float moveVelocity;

bool grounded = false;

public Transform groundCheck;

public float groundCheckRadius;

public LayerMask whatIsGround;

private bool onGround;

public Rigidbody2D rb;

private bool facingRight;

private float movementSpeed;

public Vector3 respawnPoint;

public int curHealth;

public int maxHealth = 5;

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

    facingRight = true;

    movementSpeed = 4;

    curHealth = maxHealth;
}

// Update is called once per frame
void Update()
{
    // Jump
    if (Input.GetKeyDown(KeyCode.Space))
    {
        GetComponent<Rigidbody2D>().velocity = new Vector2(
            GetComponent<Rigidbody2D>().velocity.y, jump);
    }
    if (Input.GetKeyDown(KeyCode.D))
    {
        GetComponent<Rigidbody2D>().velocity = new Vector2(
            GetComponent<Rigidbody2D>().velocity.x, movementSpeed);
    }

    if (curHealth > maxHealth)
    {
        curHealth = maxHealth;
    }

    if (curHealth <= 0)
    {
        Die();
    }
}

void FixedUpdate()
{
    float horizontal = Input.GetAxis("Horizontal");

    HandleMovement(horizontal);

    Flip(horizontal);
}

private void HandleMovement(float horizontal)
{
    rb.velocity = new Vector2(horizontal * movementSpeed, rb.velocity.y);
}

private void Flip(float horizontal)
{
    if (horizontal > 0 && !facingRight || horizontal < 0 && facingRight)
    {
        facingRight = !facingRight;

        Vector3 theScale = transform.localScale;

        theScale.x *= -1;

        transform.localScale = theScale;
    }
}

Quaternion rotation;
void Awake()
{
    rotation = transform.rotation;
}
void LateUpdate()
{
    transform.rotation = rotation;
}

void OnTriggerEnter2D(Collider2D other)
{
    if (other.tag == "FallDetector")
    {
        transform.position = respawnPoint;
    }
    if (other.tag == "Checkpoint")
    {
        respawnPoint = other.transform.position;
    }
}

void Die()
{
    Application.LoadLevel(Application.loadedLevel);
}

public void Damage(int dmg)
{
    curHealth -= dmg;
}

}

2

@Fiom1423

In the line:

if (Input.GetKeyDown(KeyCode.D))
{
GetComponent().velocity = new Vector2(
GetComponent().velocity.x, movementSpeed);
}

When you press D, you have given a velocity = movementSpeed = 4 in the y axis which makes your character jump.