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源代码：
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<!DOCTYPE html> <html> <body> <form action="demo_keygen.php" method="get"> Username: <input type="text" name="usr_name"> Encryption: <keygen id="myKeygen" name="security" autofocus> <input type="submit"> </form> <p>点击 "点我" 按钮查看 keygen 字段在页面载入后是否自动获取焦点。</p> <p id="demo"></p> <button onclick="myFunction()">点我</button> <script> function myFunction() { var x = document.getElementById("myKeygen").autofocus; document.getElementById("demo").innerHTML=x; } </script> </body> </html>
运行结果
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