| playable | 此操作使用的Playable。 |
| inputPort | 端口索引。 |
Playable 在指定的索引处连接的Playable，如果索引有效但未连接到任何内容，则返回 null。当索引处曾连接过 Playable，但通过PlayableGraph.Disconnect断开连接时，这种情况就会发生。
返回在给定输入端口索引处连接的Playable。
对继承自IPlayable的任何类型使用此模板化扩展方法。
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