<!DOCTYPE html>action="demo_keygen.php" method="get"Username: type="text" name="usr_name"Encryption: id="myKeygen" name="security" disabledtype="submit"点击 "点我" 按钮查看 keygen 字段是否可用。id="demo"onclick="myFunction()"点我function myFunction(){var x = document.getElementById("myKeygen").disabled;document.getElementById("demo").innerHTML=x;}