/**
* 校验用户名是否已存在
*
* @access public
* @return void
* @author Liuping <*****@*****.**>
*/
public function ajaxUserExist()
{
$username = I('post.loginUserName', '');
$result = [];
$pattern = '/^[a-zA-Z][a-zA-Z0-9_]{2,19}$/';
if (empty($username)) {
$result['status'] = 0;
$result['msg'] = L('CONTROLLER_MSG1');
} elseif (!preg_match($pattern, $username)) {
$result['status'] = 0;
$result['msg'] = L('CONTROLLER_MSG2');
} else {
$model = new UserModel();
if ($model->checkExistUserName($username)) {
$result['status'] = 0;
$result['msg'] = L('CONTROLLER_MSG3');
} else {
$result['status'] = 1;
$result['msg'] = L('CONTROLLER_MSG4');
}
}
if (IS_AJAX) {
$this->ajaxReturn($result, 'json');
}
}
