回答編集履歴
1
ちょうせい
answer
CHANGED
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@@ -1,6 +1,17 @@
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1
1
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```javascript
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2
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+
<script>
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2
3
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window.addEventListener('DOMContentLoaded', ()=>{
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4
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+
const keyword='ccccc';
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3
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-
const num=[...document.querySelectorAll('#Tab_container a')].map(x=>x.textContent).indexOf(
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5
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const num=[...document.querySelectorAll('#Tab_container a')].map(x=>x.textContent).indexOf(keyword);
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4
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-
console.log(num); //2
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6
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console.log(num); // 2 →hitしなければ-1になる
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5
7
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});
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8
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</script>
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9
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+
<div id="Tab_container">
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10
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+
<ul>
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11
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+
<li><a href="#">aaaaa</a></li>
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12
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+
<li><a href="#">bbbbb</a></li>
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13
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+
<li><a href="#">ccccc</a></li>
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14
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+
<li><a href="#">ddddd</a></li>
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15
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</ul>
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16
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</div>
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6
17
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```
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