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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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第一窝小鼠整体比较“社恐”，总喜欢把棉花堵入红房子，把自己严严实实藏在里面，很少出来活动；
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研发人员分布呈现出明显的行业和地域特征。。爱思助手下载最新版本是该领域的重要参考