回答編集履歴
1
情報の追加。
test
CHANGED
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@@ -25,3 +25,43 @@
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25
25
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<div id="timer">00:00:00</div>
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```**動くサンプル：**[https://jsfiddle.net/z3a33n48/](https://jsfiddle.net/z3a33n48/)
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---
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36
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**追記：**
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40
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41
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42
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43
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moredeepさんの指摘の通り、script要素の位置に問題がある可能性もありますね。
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44
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45
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【DOMContentLoaded - Web 技術のリファレンス | MDN】
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48
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[https://developer.mozilla.org/ja/docs/Web/Reference/Events/DOMContentLoaded](https://developer.mozilla.org/ja/docs/Web/Reference/Events/DOMContentLoaded)
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【DOMContentLoadedイベントとloadイベントの違い[タイミング][JavaScript]】
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[http://noumenon-th.net/programming/2017/06/11/domcontentloaded/](http://noumenon-th.net/programming/2017/06/11/domcontentloaded/)
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> ```JavaScript
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> document.addEventListener( 'DOMContentLoaded', function(){
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> //〜処理〜
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> }, false );
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> ```
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66
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