diff --git a/binblog/settings_example.py b/binblog/settings_example.py
index bcb9ece..f53e9b7 100644
--- a/binblog/settings_example.py
+++ b/binblog/settings_example.py
@@ -23,6 +23,7 @@
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
+LOCAL_DEBUG = True  # 本地代理static和media可以使用命令python manage.py runserver --insecure
 
 ALLOWED_HOSTS = ['*']
 
@@ -62,6 +63,15 @@
     'blog.middleware.LoadTimeMiddleware'  # 页面加载时间
 ]
 
+# 是否启用django-debug-toolbar. 需要安装: pip install django-debug-toolbar
+DJANGO_DEBUG_TOOLBAR = False  # 自己定义的变量, 在urls.py里也需要引入相关路由
+if DJANGO_DEBUG_TOOLBAR:  # 还有另一种 django-silk可以尝试用
+    # debug工具, 只有在debug=True才生效, 开发环境内使用, 其实可以抽多个settings.develop.py
+    INTERNAL_IPS = ['127.0.0.1']
+    INSTALLED_APPS += ['debug_toolbar', ]
+    MIDDLEWARE += ['debug_toolbar.middleware.DebugToolbarMiddleware', ]
+    # DEBUG_TOOLBAR_PANELS = []  # 可以自己找更多的插件用
+
 ROOT_URLCONF = 'binblog.urls'
 
 TEMPLATES = [
diff --git a/binblog/urls.py b/binblog/urls.py
index 9deb488..e5f3f36 100644
--- a/binblog/urls.py
+++ b/binblog/urls.py
@@ -1,5 +1,5 @@
 from django.contrib import admin
-from django.urls import path, include
+from django.urls import path, include, re_path
 from django.conf.urls.static import static
 from django.contrib.sitemaps.views import sitemap
 from django.conf import settings
@@ -46,7 +46,30 @@
     path('refresh/', refresh_cache, name='refresh'),
 ]
 
-urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
+if settings.DEBUG:
+    # 线上模式需要使用nginx来代理这些静态资源, static()其实return了一个 [re_path()对象]
+    urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
+
+    if settings.DJANGO_DEBUG_TOOLBAR:
+        # 例如在sql面板中可以看到重复执行的sql语句, 借此可以优化自己的系统
+        import debug_toolbar
+
+        urlpatterns += [path('__debug__/', include(debug_toolbar.urls)), ]
+
+if not settings.DEBUG and settings.LOCAL_DEBUG:
+    # 本地想调试线上环境可以使用 --insecure参数 Allows serving static files even if DEBUG is False.
+    # python manage.py runserver --insecure
+    # 上面的 static()方法在DEBUG=False时是return [], 不会serve media, 可以这样写用于media
+
+    # from django.views.static import serve
+    # from django.urls import re_path
+    # urlpatterns += [re_path(r'^media/(?P<path>.*$)', serve, {'document_root': settings.MEDIA_ROOT}), ]
+    # 上面这行又可以仿照static()里的实现, lstrip('/')去掉字符串左边'/'
+    from django.views.static import serve
+    import re
+
+    urlpatterns += [re_path(r'^%s(?P<path>.*$)' % re.escape(settings.MEDIA_URL.lstrip('/')),
+                            serve, {'document_root': settings.MEDIA_ROOT}), ]
 
 # 全局403 404 500设置
 handler403 = 'blog.views.permission_denied'
diff --git a/log/binblog_error.log b/log/binblog_error.log
index 5e41dd7..4241552 100644
--- a/log/binblog_error.log
+++ b/log/binblog_error.log
@@ -18,3 +18,128 @@
 [2019-06-26 16:13:11,439] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': '彬彬冲呀66666666'}
 [2019-06-26 16:13:57,928] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': '彬彬冲呀66666666'}
 [2019-06-26 16:14:53,794] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': '彬彬冲呀66666666'}
+[2019-06-28 09:29:24,112] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:29:24,284] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 09:29:25,815] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:29:26,486] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:29:26,963] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:29:27,371] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:29:27,928] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:29:28,417] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:29:31,036] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:29:33,154] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:30:12,623] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:30:13,895] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:30:14,580] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:30:18,263] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:30:19,257] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:32:26,552] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 09:32:26,555] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 09:32:26,684] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:32:27,435] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 09:33:00,118] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:33:36,284] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:33:37,259] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:33:37,881] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:33:40,995] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:33:49,451] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:33:50,124] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:33:50,608] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:34:17,579] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:37:23,618] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:37:24,302] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:38:15,600] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:40:41,760] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:40:42,566] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:40:43,744] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:40:45,372] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:40:46,516] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:40:47,382] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:40:48,836] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:40:53,479] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:42:54,223] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:42:54,916] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:42:55,481] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:43:02,496] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:43:07,907] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:43:11,273] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:43:13,947] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:43:17,519] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:43:18,382] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:43:18,896] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:43:45,961] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:52:24,351] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:52:26,595] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:59:13,115] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:59:16,016] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:59:22,217] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:59:22,974] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:59:36,836] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:59:38,081] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 09:59:38,718] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 10:01:21,196] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 10:02:58,144] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 10:03:19,391] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 10:03:20,078] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 10:03:20,896] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 10:28:04,832] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:28:04,833] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:28:06,132] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:28:06,134] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:28:06,427] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 10:28:10,720] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:28:10,721] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:28:11,038] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 10:28:29,376] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:28:29,377] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:31:09,215] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:31:09,217] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:31:12,459] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:31:12,460] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:31:12,751] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 10:31:51,646] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:31:51,647] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:32:15,148] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:32:15,225] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:32:16,172] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:32:16,185] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:32:16,467] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 10:37:01,203] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:37:01,203] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 10:37:01,206] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:37:01,499] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 10:38:09,067] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:38:09,071] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:38:09,271] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 10:38:10,201] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:38:10,203] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:38:19,892] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:38:19,930] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:38:21,088] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:38:21,092] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:38:24,767] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:38:24,769] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:38:25,081] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 10:40:13,416] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 10:40:13,423] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 10:40:14,353] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 10:42:09,387] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 10:44:18,975] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'media/photo/asfs.png'}
+[2019-06-28 11:00:55,416] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 11:00:56,432] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 11:00:56,438] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 11:00:56,657] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 11:00:57,419] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 11:00:57,423] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 11:00:57,643] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 11:01:28,252] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 11:01:28,253] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 11:01:41,779] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 11:01:41,779] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 11:01:44,269] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 11:01:44,273] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 11:01:44,500] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 11:10:34,419] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
+[2019-06-28 11:10:53,684] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/css/4dae8f1035d4.css'}
+[2019-06-28 11:10:53,687] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/CACHE/js/b3ecec28477c.js'}
+[2019-06-28 11:10:53,912] ERROR [blog.views.page_not_found:297 views] {'status': '404', 'path': 'static/favicon.ico'}
diff --git a/utils/my_lrucache.py b/utils/my_lrucache.py
new file mode 100644
index 0000000..3128f2d
--- /dev/null
+++ b/utils/my_lrucache.py
@@ -0,0 +1,121 @@
+import time
+from collections import OrderedDict  # 一个有序的Dict
+from functools import wraps
+
+
+class LRUCacheDict(object):
+    # py3: from functools import lru_cache
+    def __init__(self, max_size=1024, expiration=60):
+        self.max_size = max_size  # 最大容量, 1024个key
+        self.expiration = expiration  # 单个key有效期60秒
+        self._cache = {}  # LRU缓存 (Least Recently Used 近期最少使用)
+        self._access_time = OrderedDict()  # 记录访问时间
+        self._expire_time = OrderedDict()  # 记过过期时间
+
+    def __setitem__(self, key, value):
+        """ 设置缓存, 调用obj[key] = value执行 """
+        now = int(time.time())
+        self.__delitem__(key)  # 删除当前key
+
+        self._cache[key] = value
+        self._access_time[key] = now
+        self._expire_time[key] = now + self.expiration
+        self.cleanup()
+
+    def __getitem__(self, key):
+        """ 获取缓存中key对应的value, 调用obj['key']执行 """
+        now = int(time.time())
+        del self._access_time[key]
+
+        self._access_time[key] = now
+        self.cleanup()
+
+        return self._cache[key]
+
+    def __delitem__(self, key):
+        """ 调用 del obj['key']时候执行 """
+        if key in self._cache:
+            del self._cache[key]
+            del self._access_time[key]
+            del self._expire_time[key]
+
+    def __contains__(self, key):
+        """ 当前缓存中是否有这个key, 当调用key in obj会执行 """
+        self.cleanup()
+        return key in self._cache
+
+    def cleanup(self):
+        """ 清理过期或者超过大小的缓存 """
+        if self.expiration is None:
+            return None  # 没设置过期时间就不清理
+
+        now = int(time.time())
+        pending_del_keys = []  # 存储待删除的key
+
+        # 记录过期缓存key
+        for key, value in self._expire_time.items():
+            if value < now:
+                pending_del_keys.append(key)
+
+        # 删除过期缓存key, 因为不能在上面迭代过程中删除
+        for del_key in pending_del_keys:
+            self.__delitem__(del_key)
+
+        # 超过容量, 删除最旧的缓存
+        while len(self._cache) > self.max_size:
+            for key in self._access_time:
+                self.__delitem__(key)
+                break
+
+    def size(self):
+        """ 返回缓存长度 """
+        return len(self._cache)
+
+    def clear(self):
+        """ 清理所有缓存 """
+        self._cache.clear()
+        self._access_time.clear()
+        self._expire_time.clear()
+
+
+def cache_it(max_size=1024, expiration=60):
+    cache = LRUCacheDict(max_size, expiration)
+
+    def wrapper(func):
+        @wraps(func)
+        def inner(*args, **kwargs):
+            key = repr(*args, **kwargs)
+            try:
+                result = cache[key]
+            except KeyError:
+                result = func(*args, **kwargs)
+                cache[key] = result
+            return result
+
+        return inner
+
+    return wrapper
+
+
+@cache_it(max_size=2, expiration=2)
+def test(num):
+    time.sleep(1)  # 睡一秒, 只有第一次没缓存的时候慢
+    res = 'this is number %s' % num
+    return res
+
+
+if __name__ == '__main__':
+    cache_dict = LRUCacheDict(max_size=3, expiration=1)
+    cache_dict['name'] = 'binbin'
+    cache_dict['age'] = '22'
+    cache_dict['gender'] = 'male'
+    cache_dict['other'] = 'null'
+
+    print('name' in cache_dict)  # False, 超过最大容量, 最旧的记录被删除了
+    print('other' in cache_dict)  # True
+    time.sleep(1.5)
+    print('other' in cache_dict)  # Fasle, 过期记录被删除了
+
+    print(test(2))
+    print(test(3))
+    print(test(2))  # 这里就直接用到了缓存, 没有sleep(1)