Javascriptで動的にhtml, CSS記述時に発生したerrorへの対処の備忘録
1． DOM生成前に読み込んでいないか確認
→scriptの位置変えたり， DOMContentLoaded使ったり
2． getElementsByClassNameをいじるときは配列になることを注意
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Uncaught TypeError: Cannot set property 'value' of undefinedの解決への試行錯誤
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