diff --git a/app/src/main/assets/web/help/md/jsHelp.md b/app/src/main/assets/web/help/md/jsHelp.md
index a7e04c473..cbd3c00f8 100644
--- a/app/src/main/assets/web/help/md/jsHelp.md
+++ b/app/src/main/assets/web/help/md/jsHelp.md
@@ -173,7 +173,7 @@ java.cacheFile(url)
 java.cacheFile(url,saveTime)
 执行内容
 eval(String(java.cacheFile(url)))
-删除缓存文件
+使缓存失效
 cache.delete(java.md5Encode16(url))
 ```
 * 获取网络压缩文件里面指定路径的数据 *可替换Zip Rar 7Z
diff --git a/app/src/main/assets/web/help/md/ruleHelp.md b/app/src/main/assets/web/help/md/ruleHelp.md
index 6b57fad83..0b771fc87 100644
--- a/app/src/main/assets/web/help/md/ruleHelp.md
+++ b/app/src/main/assets/web/help/md/ruleHelp.md
@@ -188,7 +188,7 @@ let options = {
 (function(){
   var b64=String(src).match(/ttf;base64,([^\)]+)/);
   if(b64){
-    var f1 = java.queryBase64TTF(b64[1]);
+    var f1 = java.queryTTF(b64[1]);
     var f2 = java.queryTTF("https://alanskycn.gitee.io/teachme/assets/font/Source Han Sans CN Regular.ttf");
     // return java.replaceFont(result, f1, f2);
     return java.replaceFont(result, f1, f2, true); // 过滤掉f1中不存在的字形
diff --git a/app/src/main/java/io/legado/app/help/JsExtensions.kt b/app/src/main/java/io/legado/app/help/JsExtensions.kt
index 2647398c4..fe9b2065d 100644
--- a/app/src/main/java/io/legado/app/help/JsExtensions.kt
+++ b/app/src/main/java/io/legado/app/help/JsExtensions.kt
@@ -505,15 +505,6 @@ interface JsExtensions : JsEncodeUtils {
         return dateFormat.format(Date(time))
     }
 
-    /**
-     * utf8编码转gbk编码
-     */
-    fun utf8ToGbk(str: String): String {
-        val utf8 = String(str.toByteArray(charset("UTF-8")))
-        val unicode = String(utf8.toByteArray(), charset("UTF-8"))
-        return String(unicode.toByteArray(charset("GBK")))
-    }
-
     fun encodeURI(str: String): String {
         return try {
             URLEncoder.encode(str, "UTF-8")