W3School TIY Editor
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<!DOCTYPE html> <html> <body> <form action="/demo/htmldom/action_page.php"> 电子邮件：<input type="email" id="myEmail" name="usremail" multiple> <input type="submit"> </form> <p>单击“试一试”按钮，查看电子邮件字段是否接受多个值（电子邮件地址）。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myEmail").multiple; document.getElementById("demo").innerHTML = x; } </script> </body> </html>