Collision2D.contacts

# [Collision2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collision2D.html).contacts

public ContactPoint2D[] **contacts** ;

## 描述

与传入 Collider2D 接触的指定接触点。应避免使用它，因为它会产生内存垃圾。改用 [GetContact](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collision2D.GetContact.html) 或 [GetContacts](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collision2D.GetContacts.html)。

另请参阅：[Collider2D](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collider2D.html) 类。

```
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public GameObject explosion;

void OnCollisionEnter2D(Collision2D coll)
    {
        // If a missile hits this object
        if (coll.transform.tag == "Missile")
        {
            Debug.Log("HIT!");

// Spawn an explosion at each point of contact
            foreach (ContactPoint2D missileHit in coll.contacts)
            {
                Vector2 hitPoint = missileHit.point;
                Instantiate(explosion, new Vector3(hitPoint.x, hitPoint.y, 0), Quaternion.identity);
            }
        }
    }
}
```