用 MoveTowards实现多点移动

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

public class MoveCube : MonoBehaviour {
    public Vector3[] pos;
    int num=0;
    // Use this for initialization
    // Update is called once per frame
    void Update () {
     transform.position= Vector3.MoveTowards(transform.position,pos[num],0.1f);
      transform.LookAt(pos[num]);
        if (transform.position==pos[num])
        {
            num++;
            if (num >pos.Length-1)
            {
                num = pos.Length - 1;
            }
        }
    }
}