What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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我会把这邀请转发给朝新，相信他也会和我一样地回复：好，咱们约定！
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Is the tide turning on ME research?Inside Health
Author(s): Oliver A. Dicks, Solveig S. Aamlid, Alannah M. Hallas, Joerg Rottler。关于这个话题，91视频提供了深入分析