2D Android Game Rapid Jumping Problem,Unity 2018.2.9f1 Android 2d Speed Jumping

I am working on creating 2D Android Game but have the problem with jumping. Character jumps rapidly. I want to make a slower jump. I actually didn't see when the jumping began. Does anyone help me with this issue?

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityStandardAssets.CrossPlatformInput;
 
 public class CatControl : MonoBehaviour {
 
     float dirX;
     public float moveSpeed = 5f;
     Rigidbody2D rb;
     bool facingRight = true;
     Vector3 localScale;
     float jumpForce = 600f;
 
     // Use this for initialization
     void Start () {
         localScale = transform.localScale;
         rb = GetComponent<Rigidbody2D> ();
     }
     
     // Update is called once per frame
     void Update () {
         dirX = CrossPlatformInputManager.GetAxis ("Horizontal");
         if (CrossPlatformInputManager.GetButtonDown("Jump"))
             Jump();
     }
 
     void FixedUpdate()
     {
         rb.velocity = new Vector2 (dirX * moveSpeed, 0);
     }
 
     void LateUpdate()
     {        
         CheckWhereToFace ();
     }
 
     void CheckWhereToFace ()
     {
         if (dirX > 0)
             facingRight = true;
         else if (dirX < 0)
             facingRight = false;
         
         if (((facingRight) && (localScale.x < 0)) || ((!facingRight) && (localScale.x > 0)))
             localScale.x *= -1;
         
         transform.localScale = localScale;
     }
 
     void Jump()
     {
         if (rb.velocity.y == 0)
             rb.AddForce(Vector3.up * jumpForce * Time.deltaTime);
     }
 
 
 }