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<!DOCTYPE html> <html> <body> <form action="/action_page.php" method="get"> Name: <input type="text" id="myInput" name="fname" pattern=".{6,}" required> <input type="submit" value="提交"> </form> <p>如果您提交的表单少于 6 个字符，则会出现一条警告消息。</p> <p><strong>注意：</strong> Internet Explorer 9 及更早版本或 Safari 不支持 oninvalid 事件。</p> <script> document.getElementById("myInput").addEventListener("invalid", myFunction); function myFunction() { alert("Must contain 6 or more characters"); } </script> </body> </html>