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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The script grabs the captured audio element, mutes it, sets playbackRate to 16 (the browser maximum), seeks to the beginning, and calls .play(). The browser, in its infinite eagerness to keep the buffer full ahead of the playback position, frantically fetches, decrypts, and feeds chunks into the SourceBuffer. Every single one of those chunks passes through the hooked appendBuffer and gets collected.，更多细节参见旺商聊官方下载
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