diff --git a/docs/api.md b/docs/api.md
index c62c21c7..ebd28f99 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -1,6 +1,6 @@
 # 附录:API列表
 
-?> 上次更新时间：* {docsify-updated} *  如不是最新版，请Ctrl+F5强制刷新缓存。
+?> 上次更新时间：* {docsify-updated} *
 
 所有系统支持的API都列在了这里。所有可能被用到的API都在前面用\*标记。
 
diff --git a/libs/core.js b/libs/core.js
index 26977f69..145c6b9b 100644
--- a/libs/core.js
+++ b/libs/core.js
@@ -264,24 +264,15 @@ core.prototype.loader = function (callback) {
 
                 // 加载pngs
                 core.material.images.pngs = {};
+                if (core.pngs.length==0) {
+                    core.loadAutotile(callback);
+                    return;
+                }
                 for (var x=0;x<core.pngs.length;x++) {
                     core.loadImage(core.pngs[x], function (pngId, image) {
                         core.material.images.pngs[pngId] = image;
                         if (Object.keys(core.material.images.pngs).length==core.pngs.length) {
-
-                            // 加载Autotile
-                            core.material.images.autotile={};
-                            var autotileIds = Object.keys(core.material.icons.autotile);
-                            for (var x=0;x<autotileIds.length;x++) {
-                                core.loadImage(autotileIds[x], function (autotileId, image) {
-                                    core.material.images.autotile[autotileId]=image;
-                                    if (Object.keys(core.material.images.autotile).length==autotileIds.length) {
-
-                                        // 最后加载音频
-                                        core.loadMusic(callback);
-                                    }
-                                })
-                            }
+                            core.loadAutotile(callback);
                         }
                     });
                 }
@@ -290,6 +281,26 @@ core.prototype.loader = function (callback) {
     }
 }
 
+////// 加载Autotile //////
+core.prototype.loadAutotile = function (callback) {
+    core.material.images.autotile={};
+    var autotileIds = Object.keys(core.material.icons.autotile);
+    if (autotileIds.length==0) {
+        core.loadMusic(callback);
+        return;
+    }
+    for (var x=0;x<autotileIds.length;x++) {
+        core.loadImage(autotileIds[x], function (autotileId, image) {
+            core.material.images.autotile[autotileId]=image;
+            if (Object.keys(core.material.images.autotile).length==autotileIds.length) {
+
+                // 最后加载音频
+                core.loadMusic(callback);
+            }
+        })
+    }
+}
+
 ////// 加载图片 //////
 core.prototype.loadImage = function (imgName, callback) {
     try {
@@ -2907,6 +2918,9 @@ core.prototype.setItem = function (itemId, itemNum) {
         core.status.hero.items[itemCls] = {};
     }
     core.status.hero.items[itemCls][itemId] = itemNum;
+    if (itemCls!='keys' && itemNum==0) {
+        delete core.status.hero.items[itemCls][itemId];
+    }
 }
 
 ////// 删除某个物品 //////
@@ -2914,10 +2928,10 @@ core.prototype.removeItem = function (itemId) {
     if (!core.hasItem(itemId)) return false;
     var itemCls = core.material.items[itemId].cls;
     core.status.hero.items[itemCls][itemId]--;
-    core.updateStatusBar();
-    if (itemCls=='tools' && core.status.hero.items[itemCls][itemId]==0) {
+    if (itemCls!='keys' && core.status.hero.items[itemCls][itemId]==0) {
         delete core.status.hero.items[itemCls][itemId];
     }
+    core.updateStatusBar();
     return true;
 }
 
diff --git a/libs/enemys.js b/libs/enemys.js
index 8b492099..43bc5cf9 100644
--- a/libs/enemys.js
+++ b/libs/enemys.js
@@ -127,7 +127,7 @@ enemys.prototype.getSpecialHint = function (enemy, special) {
 
     switch (special) {
         case 1: return "先攻：怪物首先攻击";
-        case 2: return "魔攻：怪物无视勇士的魔防";
+        case 2: return "魔攻：怪物无视勇士的防御";
         case 3: return "坚固：勇士每回合最多只能对怪物造成1点伤害";
         case 4: return "2连击：怪物每回合攻击2次";
         case 5: return "3连击：怪物每回合攻击3次";
diff --git a/libs/items.js b/libs/items.js
index e603d3a4..149fb395 100644
--- a/libs/items.js
+++ b/libs/items.js
@@ -185,9 +185,11 @@ items.prototype.useItem = function (itemId) {
     if (itemId == 'curseWine') core.setFlag('curse', false);
     if (itemId == 'superWine') {
         core.setFlag('poison', false);
-        core.setFlag('weak', false);
-        core.status.hero.atk += core.values.weakValue;
-        core.status.hero.def += core.values.weakValue;
+        if (core.hasFlag('weak')) {
+            core.setFlag('weak', false);
+            core.status.hero.atk += core.values.weakValue;
+            core.status.hero.def += core.values.weakValue;
+        }
         core.setFlag('curse', false);
     }
     core.updateStatusBar();