From 5a5d9122bf0bbd6bf09d3be6f6f99b8b452ce255 Mon Sep 17 00:00:00 2001
From: Sky <eshengsky@163.com>
Date: Thu, 21 Apr 2016 23:56:19 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E4=B8=80=E7=82=B9=E6=B3=A8?=
 =?UTF-8?q?=E9=87=8A=EF=BC=8C=E9=85=8D=E5=90=88Wiki?=
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---
 proxy/category.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/proxy/category.js b/proxy/category.js
index 3cb90a6..76417c8 100644
--- a/proxy/category.js
+++ b/proxy/category.js
@@ -34,16 +34,22 @@ exports.getAll = function (isAll, cached, callback) {
         isAll = true;
         cached = true;
     }
+    //缓存的key名称
     var cache_key = isAll ? 'categories_all' : 'categories';
     if (cached) {
+        //尝试读取缓存
         redisClient.getItem(cache_key, function (err, categories) {
+            //读取缓存出错
             if (err) {
                 return callback(err);
             }
+            //缓存中有数据
             if (categories) {
                 return callback(null, categories);
             }
+            //缓存中没有数据，则从数据库中读取
             categoryModel.find(function (err, categories) {
+                //读取数据库出错
                 if (err) {
                     return callback(err);
                 }
@@ -51,7 +57,9 @@ exports.getAll = function (isAll, cached, callback) {
                     categories.unshift(cateAll);
                     categories.push(cateOther);
                 }
+                //从数据库中读到数据
                 if (categories) {
+                    //将数据塞入缓存
                     redisClient.setItem(cache_key, categories, redisClient.defaultExpired, function (err) {
                         if (err) {
                             return callback(err);
@@ -190,4 +198,4 @@ exports.save = function (array, callback) {
             }
         });
     });
-};
\ No newline at end of file
+};