问在预制板中存储对场景对象的引用？

EN

using UnityEngine;
using System.Collections;

public class moveTowards : MonoBehaviour
{

    public Transform target; //now you can make this variable private!


    public float speed;

    //You can call this on Start, or Awake also, but remember to do the singleton player assignation before you call that function!   
    void OnEnable()
    {
      //Way 1 -> Less optimal
      target = GameObject.Find("PlayerObjectName").transform;

      //Way 2 -> Not the best, you need to add a Tag to your player, let's guess that the Tag is called "Player"
      target = GameObject.FindGameObjectWithTag("Player").transform;

      //Way 3 -> My favourite, you need to update your Player prefab (I attached the changes below)
      target = Player.s_Singleton.gameObject.transform;
    }

    void Update()
    {

        float step = speed * Time.deltaTime;


        transform.position = Vector2.MoveTowards(transform.position, target.position, step);
    }
}

public class Player : MonoBehaviour
{

  static public Player s_Singleton;

  private void Awake(){
    s_Singleton = this; //There are better ways to implement the singleton pattern, but there is not the point of your question
  }

}