* finish task #2686.

module/common/lang/en.php

@@ -74,6 +74,7 @@ $lang->tutorialConfirm = 'You are using tutorial. Do you want to exit right now
 
 $lang->preShortcutKey  = '[Shortcut:←]';
 $lang->nextShortcutKey = '[Shortcut:→]';
+$lang->backShortcutKey = '[Shortcut:Alt+↑]';
 
 $lang->select        = 'Select';
 $lang->selectAll     = 'Select All';

module/common/lang/zh-cn.php

@@ -74,6 +74,7 @@ $lang->tutorialConfirm = '检测到你尚未退出新手教程模式，是否现
 
 $lang->preShortcutKey  = '[快捷键:←]';
 $lang->nextShortcutKey = '[快捷键:→]';
+$lang->backShortcutKey = '[快捷键:Alt+↑]';
 
 $lang->select        = '选择';
 $lang->selectAll     = '全选';

module/common/model.php

@@ -828,7 +828,8 @@ class commonModel extends model
         global $lang, $app;
         if(isonlybody()) return false;
 
-        echo html::a($backLink, '<i class="icon-goback icon-level-up icon-large icon-rotate-270"></i>', '', "class='btn' title={$lang->goback}");
+        $title = $lang->goback . $lang->backShortcutKey;
+        echo html::a($backLink, '<i class="icon-goback icon-level-up icon-large icon-rotate-270"></i>', '', "id='back' class='btn' title={$title}");
 
         if(isset($preAndNext->pre) and $preAndNext->pre) 
         {

www/js/my.full.js

@@ -1684,6 +1684,13 @@ function initHotKey()
         return false;
     });
 
+    /* Alt+up, go back to the previous page. */
+    $(document).bind('keydown', 'Alt+up', function(evt)
+    {
+        backLink = ($('#back').attr("href"));
+        if(typeof(backLink) != 'undefined') location.href = backLink;
+    });
+
     /* left, go to pre object. */
     $(document).bind('keydown', 'left', function(evt)
     {