Object.operator ==

Parameters

Description

比较两个对象引用，判断它们是否引用同一个对象。

using UnityEngine;

public class Example : MonoBehaviour
{
    public Collider target;
    void OnTriggerEnter(Collider trigger)
    {
        if (trigger == target)
        {
            print("We hit the target trigger");
        }
    }
}

如果没有目标，则及早退出。

using UnityEngine;

public class Example : MonoBehaviour
{
    public Transform target;
    void Update()
    {
        // Early out if the target is gone
        if (target == null)
        {
            return;
        }
    }
}

与 null 进行比较时要小心。

例如：

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        GameObject go = new GameObject();
        Debug.Log(go == null); // false

        Object obj = new Object();
        Debug.Log(obj == null); // true
    }
}

Instatiating a GameObject adds it to the Scene so its completely initialized (!destroyed). Instantiating a simple UnityEngine.Object has no such semantics, so the it stays in the 'destroyed' state which compares true to null.