報錯信息('style' of undefined at HTMLLIElement.lis)

作業3.html?_ijt=5h8h0o4smtc0onigbr9fumlgfd:24 Uncaught TypeError: Cannot read property ‘style’ of undefined at HTMLLIElement.lis..onclick (作業3.html?_ijt=5h8h0o4smtc0onigbr9fumlgfd:24) lis..onclick @ 作業3
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