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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。关于这个话题,新收录的资料提供了深入分析
左起为郭媛媛、马丽红、余胜泉。受访者供图
"I think that has a lot to do with the persona he was putting out there to sell the movie, as this callow youth full of braggadocio.
第五十三条 境外个人和组织为中华人民共和国境内用户提供互联网服务及相关网络产品、服务,为网络犯罪活动提供支持和帮助的,国家网信部门可以依法对其采取技术阻断措施。