diff --git a/app/Console/Commands/SyncUserActivedAt.php b/app/Console/Commands/SyncUserActivedAt.php
new file mode 100644
index 0000000..a37499b
--- /dev/null
+++ b/app/Console/Commands/SyncUserActivedAt.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\User;
+use Illuminate\Console\Command;
+
+class SyncUserActivedAt extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'larabbs:sync-user-actived-at';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = '同步最后活动时间';
+
+    /**
+     * Create a new command instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * Execute the console command.
+     * @param User $user
+     * @return mixed
+     */
+    public function handle(User $user)
+    {
+        $user->syncUserActivedAt();
+        $this->info('同步成功');
+    }
+}
diff --git a/app/Console/Kernel.php b/app/Console/Kernel.php
index f9e4410..70e3aad 100644
--- a/app/Console/Kernel.php
+++ b/app/Console/Kernel.php
@@ -27,6 +27,7 @@ class Kernel extends ConsoleKernel
         // $schedule->command('inspire')
         //          ->hourly();
         $schedule->command('larabbs:calculate-active-user')->hourly();
+        $schedule->command('larabbs:sync-user-actived-at')->dailyAt('00:05');
     }
 
     /**
diff --git a/app/Http/Kernel.php b/app/Http/Kernel.php
index 93bf68b..6d4e6ad 100644
--- a/app/Http/Kernel.php
+++ b/app/Http/Kernel.php
@@ -2,6 +2,7 @@
 
 namespace App\Http;
 
+use App\Http\Middleware\RecordLastActivedTime;
 use Illuminate\Foundation\Http\Kernel as HttpKernel;
 
 class Kernel extends HttpKernel
@@ -10,34 +11,50 @@ class Kernel extends HttpKernel
      * The application's global HTTP middleware stack.
      *
      * These middleware are run during every request to your application.
+     * 全局中间件，最先调用
      *
      * @var array
      */
     protected $middleware = [
+        // 检测是否应用是否进入『维护模式』
         \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
+        // 检测请求的数据是否过大
         \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
+        // 对提交的请求参数进行 PHP 函数 `trim()` 处理
         \App\Http\Middleware\TrimStrings::class,
+        // 将提交请求参数中空子串转换为 null
         \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
+        // 修正代理服务器后的服务器参数
         \App\Http\Middleware\TrustProxies::class,
     ];
 
     /**
      * The application's route middleware groups.
-     *
+     *定义中间件组
      * @var array
      */
     protected $middlewareGroups = [
+        // Web 中间件组，应用于 routes/web.php 路由文件
         'web' => [
+            // Cookie 加密解密
             \App\Http\Middleware\EncryptCookies::class,
+            // 将 Cookie 添加到响应中
             \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
+            // 开启会话
             \Illuminate\Session\Middleware\StartSession::class,
+            // 认证用户，此中间件以后 Auth 类才能生效
             // \Illuminate\Session\Middleware\AuthenticateSession::class,
+            // 将系统的错误数据注入到视图变量 $errors 中
             \Illuminate\View\Middleware\ShareErrorsFromSession::class,
+            // 检验 CSRF ，防止跨站请求伪造的安全威胁
             \App\Http\Middleware\VerifyCsrfToken::class,
+            // 处理路由绑定
             \Illuminate\Routing\Middleware\SubstituteBindings::class,
+            RecordLastActivedTime::class,
         ],
-
+        // API 中间件组，应用于 routes/api.php 路由文件
         'api' => [
+            // 使用别名来调用中间件
             'throttle:60,1',
             'bindings',
         ],
@@ -45,17 +62,22 @@ class Kernel extends HttpKernel
 
     /**
      * The application's route middleware.
-     *
+     * 中间件别名设置，允许你使用别名调用中间件，例如上面的 api 中间件组调用
      * These middleware may be assigned to groups or used individually.
      *
      * @var array
      */
     protected $routeMiddleware = [
+        //只有登录用户才能访问，我们在控制器的构造方法中大量使用
         'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
         'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
+        // 处理路由绑定
         'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
+        // 用户授权功能
         'can' => \Illuminate\Auth\Middleware\Authorize::class,
+        // 只有游客才能访问，在 register 和 login 请求中使用，只有未登录用户才能访问这些页面
         'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
+        // 访问节流，类似于 『1 分钟只能请求 10 次』的需求，一般在 API 中使用
         'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
     ];
 }
diff --git a/app/Http/Middleware/RecordLastActivedTime.php b/app/Http/Middleware/RecordLastActivedTime.php
new file mode 100644
index 0000000..18d239a
--- /dev/null
+++ b/app/Http/Middleware/RecordLastActivedTime.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+
+class RecordLastActivedTime
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request $request
+     * @param  \Closure $next
+     * @return mixed
+     */
+    public function handle($request, Closure $next)
+    {
+
+        $response = $next($request);
+        if (\Auth::getUser()) {
+            \Auth::user()->recordLastActivedAt();
+        }
+        return $response;
+    }
+}
diff --git a/app/Models/User.php b/app/Models/User.php
index c6ef919..08dc6df 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -2,12 +2,18 @@
 
 namespace App\Models;
 
-use App\Models\Traits\ActiveUserHelper;
+use App\Traits\ActiveUserHelper;
+use App\Traits\LastActivedAtHelper;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Illuminate\Support\Facades\Auth;
 use Spatie\Permission\Traits\HasRoles;
 
+/**
+ * Class User
+ * @property string avatar
+ * @package App\Models
+ */
 class User extends Authenticatable
 {
     use Notifiable {
@@ -15,6 +21,7 @@ class User extends Authenticatable
     }
     use HasRoles;
     use ActiveUserHelper;
+    use LastActivedAtHelper;
 
     /**
      * The attributes that are mass assignable.
@@ -34,11 +41,23 @@ class User extends Authenticatable
         'password', 'remember_token',
     ];
 
+    /**
+     * @return string
+     */
     public function getHeaderAttribute()
     {
         return asset($this->avatar);
     }
 
+    public function getLastActiveATAttribute($value)
+    {
+        return $this->getLastActivedAt($value);
+    }
+
+
+    /**
+     * @param $path
+     */
     public function setAvatarAttribute($path)
     {
         if (!starts_with($path, 'http')) {
@@ -47,21 +66,34 @@ class User extends Authenticatable
         $this->attributes['avatar'] = $path;
     }
 
+    /**
+     * @param $model
+     * @return bool
+     */
     public function isAuthorOf($model)
     {
         return $this->id == $model->user_id;
     }
 
+    /**
+     * @return \Illuminate\Database\Eloquent\Relations\HasMany
+     */
     public function replies()
     {
         return $this->hasMany(Reply::class, 'user_id');
     }
 
+    /**
+     * @return \Illuminate\Database\Eloquent\Relations\HasMany
+     */
     public function topics()
     {
         return $this->hasMany(Topic::class);
     }
 
+    /**
+     * @param $value
+     */
     public function setPasswordAttribute($value)
     {
         if (!isset($value[59])) {
@@ -70,6 +102,9 @@ class User extends Authenticatable
         $this->attributes['password'] = $value;
     }
 
+    /**
+     * @param $instance
+     */
     public function notify($instance)
     {
         if ($this->id == Auth::id()) {
diff --git a/app/Models/Traits/ActiveUserHelper.php b/app/Traits/ActiveUserHelper.php
similarity index 99%
rename from app/Models/Traits/ActiveUserHelper.php
rename to app/Traits/ActiveUserHelper.php
index 488e607..912f50a 100644
--- a/app/Models/Traits/ActiveUserHelper.php
+++ b/app/Traits/ActiveUserHelper.php
@@ -6,7 +6,7 @@
  * Time: 17:16
  */
 
-namespace App\Models\Traits;
+namespace App\Traits;
 
 
 use App\Models\Reply;
diff --git a/app/Traits/LastActivedAtHelper.php b/app/Traits/LastActivedAtHelper.php
new file mode 100644
index 0000000..84d5ec1
--- /dev/null
+++ b/app/Traits/LastActivedAtHelper.php
@@ -0,0 +1,80 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: xing
+ * Date: 2018/6/2
+ * Time: 22:29
+ */
+
+namespace App\Traits;
+
+
+use Carbon\Carbon;
+use Illuminate\Support\Facades\Redis;
+
+/**
+ * Trait LastActivedAtHelper
+ * @property int id
+ * @package App\Traits
+ */
+trait LastActivedAtHelper
+{
+    // 缓存相关
+    protected $hash_prefix = 'larabbs_last_actived_at_';
+    protected $field_prefix = 'user_';
+
+    public function recordLastActivedAt()
+    {
+        // 获取今天的日期
+        $date = Carbon::now()->toDateString();
+
+        // Redis 哈希表的命名，如：larabbs_last_actived_at_2017-10-21
+        $hash = $this->hash_prefix . $date;
+
+        // 字段名称，如：user_1
+        $field = $this->field_prefix . $this->id;
+
+        // 当前时间，如：2017-10-21 08:35:15
+        $now = Carbon::now()->toDateTimeString();
+
+        // 数据写入 Redis ，字段已存在会被更新
+        Redis::hSet($hash, $field, $now);
+    }
+
+    public function syncUserActivedAt()
+    {
+        // 获取昨天的日期，格式如：2017-10-21
+        $yesterday_date = Carbon::yesterday()->toDateString();
+        // Redis 哈希表的命名，如：larabbs_last_actived_at_2017-10-21
+        $hash = $this->hash_prefix . $yesterday_date;
+
+        // 从 Redis 中获取所有哈希表里的数据
+        $dates = Redis::hGetAll($hash);
+
+        // 遍历，并同步到数据库中
+        foreach ($dates as $user_id => $actived_at) {
+            // 会将 `user_1` 转换为 1
+            $user_id = str_replace($this->field_prefix, '', $user_id);
+
+            // 只有当用户存在时才更新到数据库中
+            if ($user = $this->find($user_id)) {
+                $user->last_active_at = $actived_at;
+                $user->save();
+            }
+        }
+
+        // 以数据库为中心的存储，既已同步，即可删除
+        Redis::del($hash);
+    }
+
+    public function getLastActivedAt($value)
+    {
+        $date = Carbon::now()->toDateString();
+
+        // Redis 哈希表的命名，如：larabbs_last_actived_at_2017-10-21
+        $hash = $this->hash_prefix . $date;
+        $field = $this->field_prefix . $this->id;
+        $date = Redis::hGet($hash, $field) ?: $value;
+        return $date ? new Carbon($date) : $this->created_at;
+    }
+}
\ No newline at end of file
diff --git a/database/migrations/2018_06_02_215326_add_references.php b/database/migrations/2018_06_02_215326_add_references.php
new file mode 100644
index 0000000..6bc5cab
--- /dev/null
+++ b/database/migrations/2018_06_02_215326_add_references.php
@@ -0,0 +1,41 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddReferences extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('topics', function (Blueprint $table) {
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+        });
+
+        Schema::table('replies', function (Blueprint $table) {
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+            $table->foreign('topic_id')->references('id')->on('topics')->onDelete('cascade');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('topics', function (Blueprint $table) {
+            $table->dropForeign(['user_id']);
+        });
+
+        Schema::table('replies', function (Blueprint $table) {
+            $table->dropForeign(['user_id', 'topic_id']);
+        });
+    }
+}
diff --git a/database/migrations/2018_06_02_230607_add_last_actived_at_to_users_table.php b/database/migrations/2018_06_02_230607_add_last_actived_at_to_users_table.php
new file mode 100644
index 0000000..5153717
--- /dev/null
+++ b/database/migrations/2018_06_02_230607_add_last_actived_at_to_users_table.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddLastActivedAtToUsersTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->timestamp('last_active_at')->nullable();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropColumn('last_active_at');
+        });
+    }
+}
diff --git a/resources/views/users/show.blade.php b/resources/views/users/show.blade.php
index 7af82ab..555f707 100644
--- a/resources/views/users/show.blade.php
+++ b/resources/views/users/show.blade.php
@@ -19,6 +19,8 @@
                             <hr>
                             <h4><strong>注册于</strong></h4>
                             <p>{{ $user->created_at->diffForHumans() }}</p>
+                            <h4><strong>最后活跃</strong></h4>
+                            <p title="{{  $user->last_actived_at }}">{{ $user->last_active_at->diffForHumans() }}</p>
                         </div>
                     </div>
                 </div>