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Input Password maxLength 属性
tryjsref_password_maxlength2
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<!DOCTYPE html> <html> <body> Password: <input type="password" id="myPsw"> <p>Click the button to set the maximum number of characters allowed in the password field.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myPsw").maxLength = "10"; document.getElementById("demo").innerHTML = "Maximum number of characters allowed in the password field is now 10."; } </script> </body> </html>