GameObject.BroadcastMessage

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

public void **BroadcastMessage** (string **methodName**, object **parameter**= null, [SendMessageOptions](https://docs.unity3d.com/cn/2019.4/ScriptReference/SendMessageOptions.html) **options**= SendMessageOptions.RequireReceiver);

## 描述

调用此游戏对象或其任何子项中的每个 [MonoBehaviour](https://docs.unity3d.com/cn/2019.4/ScriptReference/MonoBehaviour.html) 上名为 `methodName` 的方法。

通过使用零参数，该接收方法可选择忽略 /parameter/。 如果选项设置为 [SendMessageOptions.RequireReceiver](https://docs.unity3d.com/cn/2019.4/ScriptReference/SendMessageOptions.RequireReceiver.html)，则在任何组件均未拾取此消息时输出错误。

```
using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        /// Calls the function ApplyDamage with a value of 5
        /// // Every script attached to the game object and all its children
        // that has a ApplyDamage function will be called.
        gameObject.BroadcastMessage("ApplyDamage", 5.0);
    }
}

public class Example2 : MonoBehaviour
{
    public void ApplyDamage(float damage)
    {
        print(damage);
    }
}
```