2D playerController code problem

Unity Engine
1

Hey, I am making a 2D game for fun and to show to my friends. I am watching youtube videos to help me learn code. My game was working until I tried to make it so when my player jumped backwards the character would show the jumping animation backwards. Somewhere I messed up and need help. As soon as I start my game, my player just flies up. If I uncheck the playerController script then nothing happens, so I know it;s in the script. If someone could tell me what;s wrong it would mean a lot. Here is my code:
using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

public float moveSpeed;
private float moveVelocity;
public float jumpHeight;

public Transform groundCheck;
public float GroundCheckRadius;
public LayerMask whatIsGround;
private bool grounded;
private bool doubleJumped;
private Animator anim;

// Use this for initialization
void Start () {
anim = GetComponent ();

}
void FixedUpdate (){
grounded = Physics2D.OverlapCircle (groundCheck.position, GroundCheckRadius, whatIsGround);
}

// Update is called once per frame
void Update () {

if (grounded)
doubleJumped = false;
anim.SetBool (“Grounded”, grounded);
//jump
if(Input.GetKeyDown(KeyCode.Space) && grounded)// <---- can only jump on ground
{
//rigidbody2D.velocity = new Vector2 (rigidbody2D.velocity.x, jumpHeight);
jump ();
}
//dbl jump
{
rigidbody2D.velocity = new Vector2 (rigidbody2D.velocity.x, jumpHeight);
jump ();
doubleJumped = true;
}

moveVelocity = 0f;
//move right
if(Input.GetKey(KeyCode.D))
{
rigidbody2D.velocity = new Vector2 (moveSpeed, rigidbody2D.velocity.y);
moveVelocity = moveSpeed;

}

rigidbody2D.velocity = new Vector2 (moveVelocity, rigidbody2D.velocity.y);
//move left
if(Input.GetKey(KeyCode.A))
{
rigidbody2D.velocity = new Vector2 (-moveSpeed, rigidbody2D.velocity.y);
moveVelocity = -moveSpeed;
}
anim.SetFloat(“Speed”, Mathf.Abs(rigidbody2D.velocity.x));

if(rigidbody2D.velocity.x > 0)
transform.localScale = new Vector3( 1f, 1f, 1f);
else if (rigidbody2D.velocity.x > 0)
transform.localScale = new Vector3( -1f, 1f, 1f);
}
public void jump ()
{
rigidbody2D.velocity = new Vector2 (rigidbody2D.velocity.x, jumpHeight);
}

}

Thank You in advance:)

2

This section of your code is always running and also doing the same thing (add Y force to your player) twice!!
//dbl jump
{
rigidbody2D.velocity = new Vector2 (rigidbody2D.velocity.x, jumpHeight);
jump ();
doubleJumped = true;
}

3

How do I fix that @GuiLino

Thank you but how could I fix this?