使用ajax codeigniter检查用户名和密码是否匹配

I am currently doing a project and on my project there's an login modal. The things that I've done so far using ajax are: 1) Check the both field username and password have a value; 2) The username field only has a value(password field is blank); 3) Check if the account is verified or notI am currently doing a project and on my projec