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 af828e395..56d4f5d69 100644
--- a/app/src/main/java/io/legado/app/help/JsExtensions.kt
+++ b/app/src/main/java/io/legado/app/help/JsExtensions.kt
@@ -46,9 +46,10 @@ interface JsExtensions {
      * js实现文件下载
      */
     fun downloadFile(content: String, url: String): String {
+        val type = AnalyzeUrl(url).type ?: return "type为空，未下载"
         val zipPath = FileUtils.getPath(
             FileUtils.createFolderIfNotExist(FileUtils.getCachePath()),
-            "${MD5Utils.md5Encode16(url)}.zip"
+            "${MD5Utils.md5Encode16(url)}.${type}"
         )
         FileUtils.deleteFile(zipPath)
         val zipFile = FileUtils.createFileIfNotExist(zipPath)
@@ -137,14 +138,18 @@ interface JsExtensions {
      * js实现解码,不能删
      */
     fun base64Decode(str: String): String {
-        return EncoderUtils.base64Decode(str)
+        return EncoderUtils.base64Decode(str, Base64.NO_WRAP)
+    }
+
+    fun base64Decode(str: String, flags: Int): String {
+        return EncoderUtils.base64Decode(str, flags)
     }
 
     fun base64Encode(str: String): String? {
-        return EncoderUtils.base64Encode(str)
+        return EncoderUtils.base64Encode(str, Base64.NO_WRAP)
     }
 
-    fun base64Encode(str: String, flags: Int = Base64.NO_WRAP): String? {
+    fun base64Encode(str: String, flags: Int): String? {
         return EncoderUtils.base64Encode(str, flags)
     }
 
diff --git a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
index 30246e0cf..b4650d9f5 100644
--- a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
+++ b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
@@ -52,6 +52,7 @@ class AnalyzeUrl(
     var url: String = ""
     val headerMap = HashMap<String, String>()
     var body: String? = null
+    var type: String? = null
     private lateinit var urlHasQuery: String
     private var queryStr: String? = null
     private val fieldMap = LinkedHashMap<String, String>()
@@ -60,7 +61,6 @@ class AnalyzeUrl(
     private var method = RequestMethod.GET
     private val splitUrlRegex = Regex(",\\s*(?=\\{)")
     private var proxy: String? = null
-    private var type: String? = null
 
     init {
         baseUrl = baseUrl.split(splitUrlRegex, 1)[0]
diff --git a/app/src/main/java/io/legado/app/utils/StringUtils.kt b/app/src/main/java/io/legado/app/utils/StringUtils.kt
index 8ee17662d..a2e2c4388 100644
--- a/app/src/main/java/io/legado/app/utils/StringUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/StringUtils.kt
@@ -305,7 +305,7 @@ object StringUtils {
         }
         return sb.toString()
     }
-   
+
     fun hexStringToByte(hexString: String): ByteArray? {
         val hexStr = hexString.replace(" ", "")
         val len = hexStr.length