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JS 参考手册
Input Password pattern 属性
tryjsref_password_pattern
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<!DOCTYPE html> <html> <body> <p>A form with a password field that must contain 6 or more characters:</p> <form action="/action_page.php"> Password: <input type="password" id="myPsw" name="pw" pattern=".{6,}" title="Six or more characters"> <input type="submit"> </form> <p>Click the "Try it" button to display the value of the pattern attribute of the email field.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myPsw").pattern; document.getElementById("demo").innerHTML = x; } </script> </body> </html>