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querySelectorAllとgetElementByClassNameの違い

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はじめに

querySelectorAllでは取得するノードをCSSのセレクタのように指定できる。便利です。こっちだけで充分...ではなかった。
とりあえずlengthプロパティが使えなかった。
見つけたら追記していく。

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