W3School TIY Editor
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<!DOCTYPE html> <html> <body> <form id="myForm" action="/demo/htmldom/action_page.php" novalidate> 电邮：<input type="email" name="user_email"> <input type="submit"> </form> <p>单击“试一试”按钮可查看提交时是否应验证表单数据。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myForm").noValidate; document.getElementById("demo").innerHTML = x; } </script> </body> </html>