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- <!DOCTYPE html>
- <html lang="ja">
- <head>
- <meta charset="UTF-8">
- <title>get h3 test</title>
- <style>
- h3:before{
- content: attr(data-index)"";
- display: block;
- }
- </style>
- </head>
- <body>
- <div>
- <h3 data-index="">test1</h3>
- <p>test</p>
- <h3 data-index="">test2</h3>
- <p>test</p>
- <h3 data-index="">test3</h3>
- <p>test</p>
- </div>
- <script>
- const getH3 = ()=>{
- let num;
- let i;
- const allH3 = document.querySelectorAll("h3");
- for(i = 0; i <= allH3.length; i++ ){
- num = allH3[i].dataset;
- num.index = Number([i])+1;
- }
- };
- getH3();
- </script>
- </body>
- </html>
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