| playable | 此操作所用的 Playable。 |
| outputPort | 端口索引。 |
Playable 指定输出索引处连接的 Playable，如果索引有效但未连接任何可播放项，则返回 null。如果曾在索引处连接了可播放项，但又通过 PlayableGraph.Disconnect 断开了连接，则会出现这种情况。
返回给定输出端口索引处连接的 Playable。
Use this templated extension method on any type that inherits from IPlayable.
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