PHP: //用户名检测 $rt = $db->get_one("SELECT uid FROM members WHERE username='$username'"); if($rt){ echo"<script language=\"JavaScript1.2\">parent.retmsg('3','$username');</script>"; exit; } else { echo"<script language=\"JavaScript1.2\">parent.retmsg('4','$username');</script>"; exit; } :heart: :heart: