diff --git a/function/common.php b/function/common.php
index badfb6f..dac6028 100644
--- a/function/common.php
+++ b/function/common.php
@@ -859,7 +859,7 @@ function splitlast($str, $split)
         $tmp[1] = substr($str, $pos+1);
     } else {
         $tmp[0] = '';
-        $tmp[1] = $str;
+        $tmp[1] = substr($str, 1);
     }
     return $tmp;
 }
@@ -934,28 +934,37 @@ function MSAPI($method, $path, $data = '', $access_token)
 
 function fetch_files($path = '/')
 {
+    global $exts;
     $path1 = path_format($path);
     $path = path_format($_SERVER['list_path'] . path_format($path));
     if (!($files = getcache('path_' . $path))) {
         // https://docs.microsoft.com/en-us/graph/api/driveitem-get?view=graph-rest-1.0
         // https://docs.microsoft.com/zh-cn/graph/api/driveitem-put-content?view=graph-rest-1.0&tabs=http
         // https://developer.microsoft.com/zh-cn/graph/graph-explorer
-        $pos = strrpos($path, '/');
-        if ($pos>1) {
-            $parentpath = substr($path, 0, $pos);
-            $filename = substr($path, $pos+1);
-            if ($parentfiles = getcache('path_' . $parentpath))
-                foreach ($parentfiles['children'] as $file)
-                    if ($file['name']==$filename)
-                        if (isset($file['@microsoft.graph.downloadUrl']))
-                            return $file;
+        $pos = splitlast($path, '/');
+        $parentpath = $pos[0];
+        $filename = $pos[1];
+        if ($parentfiles = getcache('path_' . $parentpath. '/')) {
+            if (isset($parentfiles['children'][$filename]['@microsoft.graph.downloadUrl'])) {
+                if (in_array(splitlast($filename,'.')[1], $exts['txt'])) {
+                    if (!(isset($parentfiles['children'][$filename]['content'])&&$parentfiles['children'][$filename]['content']['stat']==200)) {
+                        $content1 = curl_request($parentfiles['children'][$filename]['@microsoft.graph.downloadUrl']);
+                        $parentfiles['children'][$filename]['content'] = $content1;
+                        savecache('path_' . $parentpath. '/', $parentfiles);
+                    }
+                }
+                return $parentfiles['children'][$filename];
+            }
         }
+
         $url = $_SERVER['api_url'];
         if ($path !== '/') {
             $url .= ':' . $path;
             if (substr($url,-1)=='/') $url=substr($url,0,-1);
         }
         $url .= '?expand=children(select=name,size,file,folder,parentReference,lastModifiedDateTime,@microsoft.graph.downloadUrl)';
+        $retry = 0;
+        $arr = [];
         while ($retry<3&&!$arr['stat']) {
             $arr = curl_request($url, false, ['Authorization' => 'Bearer ' . $_SERVER['access_token']]);
             $retry++;
@@ -1002,7 +1011,7 @@ function children_name($children)
 {
     $tmp = [];
     foreach ($children as $file) {
-        $tmp[$file['name']] = $file;
+        $tmp[strtolower($file['name'])] = $file;
     }
     return $tmp;
 }
@@ -1115,6 +1124,10 @@ function render_list($path = '', $files = '')
     global $exts;
     global $constStr;
 
+    if (isset($files['children']['index.html']) && !$_SERVER['admin']) {
+        $htmlcontent = fetch_files(spurlencode(path_format($path . '/index.html'),'/'))['content'];
+        return output($htmlcontent['body'], $htmlcontent['stat']);
+    }
     $path = str_replace('%20','%2520',$path);
     $path = str_replace('+','%2B',$path);
     $path = str_replace('&','&amp;',path_format(urldecode($path))) ;
@@ -1147,12 +1160,12 @@ function render_list($path = '', $files = '')
 
     $theme = getConfig('theme');
     if ( $theme=='' || !file_exists('theme/'.$theme) ) $theme = 'classic.php';
-    $htmlpage = include 'theme/'.$theme;
+    include 'theme/'.$theme;
 
     $html = '<!--
     Github ： https://github.com/ldxw/OneManager-php
 -->' . ob_get_clean();
-    if (isset($htmlpage['statusCode'])) return $htmlpage;
+    //if (isset($htmlpage['statusCode'])) return $htmlpage;
     if (isset($_SERVER['Set-Cookie'])) return output($html, $statusCode, [ 'Set-Cookie' => $_SERVER['Set-Cookie'], 'Content-Type' => 'text/html' ]);
     return output($html,$statusCode);
 }
diff --git a/version b/version
index 47d021d..9837280 100644
--- a/version
+++ b/version
@@ -1,3 +1,9 @@
+20200321-1830.15
+<font color=red>本次更新后，'index.html'功能在其它主题会导致bug。</font>
+文本类文件将缓存；添加hideFunctionalityFile开关；在添加网盘时会显示已经在用的标签。
+<font color=red>after this update, then 'index.html' function will bug in other theme.</font>
+cache text file content;add hideFunctionalityFile;list exist disktags when AddDisk。
+
 20200311-2150.14
 Add a switch, can download a known file or not, while the folder is encrypted.
 Hide time and size in mobile.
@@ -5,7 +11,6 @@ Now, you can get a random 'jpg' from a folder when you type '?random=jpg' after
 增加一个开关，在目录加密后能否下载其中的某个文件。
 在手机上浏览时，隐藏修改时间跟大小。
 加入一个功能，现在可以在某个目录后面加上'?random=jpg'来得到本目录里面的一张随机jpg。
-
 20200229-1300.13
 In SCF, some config can input Special symbols now, like ?&= 。
 在SCF中，某些配置可以输入特殊符号了，像background可以用?&=之类的了。