W3School TIY Editor
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<!DOCTYPE html> <html> <body> <form action="/demo/htmldom/action_page.php"> 星期：<input type="week" id="myWeek" name="week_year" required> <input type="submit"> </form> <p>请点击“试一试”按钮，查看是否必须在提交表格前填写星期字段。</p> <button onclick="myFunction()">试一试</button> <p><b>注意：</b>Internet Explorer 或 Firefox 不支持带有 type="week" 的输入元素。</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myWeek").required; document.getElementById("demo").innerHTML = x; } </script> </body> </html>