1， 直接拖物件賦值。

public GameObject cube;

2， Find函式

	public GameObject cube;

	public void ChangeColor2Red()
	{
		print ("Change cube color to red");
		cube = GameObject.Find ("Cube");
		cube.GetComponent<MeshRenderer> ().material.color = Color.red;
		
	}

		cube = GameObject.FindWithTag ("Cube");//這兒是Tag值
		cube = GameObject.FindGameObjectWithTag ("Cube");
 

3， 不一樣的拖動賦值。

例項化moveCube

ChangeColor.cs

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

public class ChangeColor : MonoBehaviour {

	public Move moveCube;

	// Use this for initialization
	void Start () {
		moveCube.ChangeColor2Red ();
		
	}
	
	// Update is called once per frame
	void Update () {
		
	}
}
 

Move.cs

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

public class Move : MonoBehaviour {

	private GameObject cube;

	public void ChangeColor2Red()
	{
		print ("Change cube color to red");
		cube = GameObject.Find ("Cube");
		cube.GetComponent<MeshRenderer> ().material.color = Color.red;
		
	}

	// Use this for initialization
	void Start () {
		
	}
	
	// Update is called once per frame
	void Update () {
		
	}
}