/// <summary>
/// 通过账号和密码验证用户是否存在，存在返回true运行登录，否则拒绝登录
/// </summary>
/// <param name="account"></param>
/// <param name="passWord"></param>
/// <returns></returns>
public bool landing(string account, string passWord)
{
return(db.userExist(account, passWord));
}