回答編集履歴
1
これで動くはず
test
CHANGED
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@@ -7,3 +7,91 @@
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7
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```
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開発ツールで見るとエラーが出ているので、解消していくとたどり着けるはずです。
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これで動くはず
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14
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15
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---
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```html
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<!DOCTYPE html>
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<html lang="ja">
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<head>
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<meta charset="UTF-8">
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<script type="text/javascript">
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(function() {
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'use strict';
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document.addEventListener("DOMContentLoaded", function(){
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var start = document.getElementById('start');
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var stop = document.getElementById('stop');
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var result = document.getElementById('result');
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var startTime;
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start.addEventListener('click', function() {
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startTime = Date.now();
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});
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stop.addEventListener('click', function() {
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var elapsedTime;
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elapsedTime = (Date.now()-startTime)/1000;
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result.textContent = elapsedTime;
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});
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}, false);
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})();
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</script>
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</head>
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<body>
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<div class ="container">
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<div id="target">5.000</div>
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<div id="result">0.000</div>
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<div id="buttons">
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85
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<div id="start">start</div>
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<div id="stop">stop</div>
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</div>
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91
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</div>
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</body>
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</html>
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96
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```
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