this script in Javascript??

hello!

i am trying to recreate a C# script into a Javascript but i can seem to get it. here is the script:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class Target : MonoBehaviour {
         public List<Transform> targets;
         public Transform selectedTarget;
     
         private Transform myTransform;
 
     // Use this for initialization
     void Start () {
         targets = new List<Transform>();
         AddAllEnemies();
         selectedTarget = null;
         myTransform = transform;
     
     }
     
     public void AddAllEnemies()
     {
     
         GameObject[] go = GameObject.FindGameObjectsWithTag("Enemy");
         
         foreach(GameObject enemy in go)
                 AddTarget(enemy.transform);
 
     }
     
     public void AddTarget(Transform enemy)
     {
         targets.Add (enemy);    
     }
     
     private void SortTargetsByDistance()
     {
         targets.Sort (delegate(Transform t1, Transform t2) {
             return Vector3.Distance(t1.position, myTransform.position).CompareTo(Vector3.Distance(t2.position, myTransform.position));
         });
         
     }
     
     private void TargetEnemy()
     {
         if(selectedTarget == null)
         {
         SortTargetsByDistance();    
         selectedTarget = targets[0];
         }
         else
         {
             int index = targets.IndexOf(selectedTarget);
             
             if(index < targets.Count -1)
             {
                 index++;    
             }
             else
             {
                 index = 0;    
             }
             DeselectTarget();
             selectedTarget = targets[index];
             
         }
         SelectTarget();
     }
     
     
     private void SelectTarget()
     {
         
     selectedTarget.renderer.material.color = Color.red;
         
     PlayerAttack pa = (PlayerAttack)GetComponent("PLayerAttack");
         
     pa.target = selectedTarget.gameObject;
     }
     
     
     private void DeselectTarget()
     {
         selectedTarget.renderer.material.color = Color.blue;
         selectedTarget = null;
     }
     
     // Update is called once per frame
     void Update () {
         
         if(Input.GetKeyDown(KeyCode.Tab))
         {
             TargetEnemy();
         }
     }
 }