ytapi/application/admin/controller/Login.php

<?php
namespace app\admin\controller;
use think\Controller;
use think\Session;
use think\Db;
use think\Request;
class Login extends Controller
{
    public function index()
    {

        return $this->fetch();
    }

    public function dologin()
    {

     	$res=array();
    	if ($this->request->isAjax()&&$this->request->isPost()) {
    		$data = $_POST;

    		$admin=Db::name('admins')->where('username',$data['username'])->find();
            if($admin){
                if($admin['password']==md5($data['password'])){
                    session('admin',$admin);//保存账号信息
                    $res=array("status"=>1,"msg"=>'success');
                }else{
                    $res=array("status"=>0,"msg"=>'密码错误');
                }
            }else{
                $res=array("status"=>0,"msg"=>'该账号不存在');
            }

    	}else{
    		$res=array("status"=>0,"msg"=>'非法请求');
            
    	}

    	echo json_encode($res);
    }


    public function logout()
    {
       session(null);

       $this->redirect('Login/index');      
    }
}