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public function check(){
		
		$username = safe_html($_POST['username']);//获取UserName，使用safe_html函数进行过滤
		$password = safe_html($_POST['password']);
		$verifycode = safe_html($_POST['verifycode']);
		if(empty($username)||empty($password)){
			showmsg(C('user_pass_empty'),'-1');
		}
		
		if($verifycode!=$_SESSION['code']){
			showmsg(C('verifycode_error'),'-1');
		}
		
		$sql="select * from ".DB_PRE."admin where `username`='$username'";//这里讲UserName带人sql语句中
		if($this->mysql->num_rows($sql)==0){
			showmsg(C('user_not_exist'),'-1');
		}
		
		$rs=$this->mysql->get_one($sql);
		$password=password($password,$rs['encrypt']);
		if($password!=$rs['password']){
			showmsg(C('password_error'),'-1');
		}
		
		if($rs['is_lock']==1){
			showmsg(C('user_lock'),'-1');
		}
		
		$logins=$rs["logins"]+1;
		$ip=safe_replace(safe_html(getip()));
		$this->mysql->db_update("admin","`last_ip`='".$ip."',`last_time`=".datetime().",`logins`=".$logins,"`username`='$username'");
		
		$_SESSION['admin']=$rs['username'];
		$_SESSION['admin_id']=$rs['id'];
		$_SESSION['groupid']=$rs['groupid'];
		unset($rs);
		showmsg(C("login_success"),"index.php?m=xdcms&c=index");
	}

//安全过滤函数
function safe_html($str){
	if(empty($str)){return;}
	$str=preg_replace('/select|insert | update | and | in | on | left | joins | delete |\%|\=|\/\*|\*|\.\.\/|\.\/| union | from | where | group | into |load_file
|outfile/','',$str);
	return htmlspecialchars($str);
}