Unity物体变色

using System.Collections.Generic;
using UnityEngine;

public class CS : MonoBehaviour
{
    private GameObject obj1;
    private Material m1;
    // Start is called before the first frame update
    void Start()
    {

         obj1 = GameObject.Find("Cube");
        Debug.Log(obj1.GetComponent<Renderer>().material.name);
      //  obj1.GetComponent<Renderer>().material.color = Color.white;

    }

    // Update is called once per frame
    void Update()
    {
        
    }
    public void SetBtn1()
    {
        // Debug.Log(obj1.GetComponent<Renderer>().material.color.a);
        obj1.GetComponent<Renderer>().material.color = Color.red;
    }
    public void SetBtn2()
    {
        obj1.GetComponent<Renderer>().material.color = Color.yellow;
       // obj1.GetComponent<Material>().color = Color.yellow;
    }
    public void SetBtn3()
    {
        obj1.GetComponent<Renderer>().material.color = Color.blue;
        Invoke("Set1",0.6f);
        
    }
    public void Set1()
    {
        obj1.GetComponent<Renderer>().material.color = Color.Lerp(Color.red,Color.magenta,5f);
    }
//    public void OnDisable()
//    {
//        obj1.GetComponent<Renderer>().material.color = Color.white;
//    }

}