禁用及不禁用 keygen 字段 - 在线编辑器

          <form action="demo_keygen.php" method="get">
  用户名: <input type="text" name="usr_name"> 加密: <keygen id="myKeygen" name="security">
  <input type="submit">
</form><br>
<button onclick="disableKey()">禁用 Keygen 字段</button>
<button onclick="undisableKey()">启用 Keygen 字段</button>
<script>
  function disableKey() {
    document.getElementById("myKeygen").disabled = true;
  }

  function undisableKey() {
    document.getElementById("myKeygen").disabled = false;
  }
</script>
        