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Input Month required 属性
tryjsref_month_required
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<!DOCTYPE html> <html> <body> <form action="/action_page.php"> Month: <input type="month" id="myMonth" name="bdaymonth" required> <input type="submit"> </form> <p>Click the "Try it" button to find out if the month field must be filled out before submitting the form.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> input elements with type="month" do not show as any date field/calendar in Firefox.</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myMonth").required; document.getElementById("demo").innerHTML = x; } </script> </body> </html>