diff --git a/app/src/main/java/io/legado/app/data/entities/BookChapter.kt b/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
index f448f6c85..507e50261 100644
--- a/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
+++ b/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
@@ -33,7 +33,7 @@ import splitties.init.appCtx
 data class BookChapter(
     var url: String = "",               // 章节地址
     var title: String = "",             // 章节标题
-    var isVolume: Boolean = false,    // 是否是卷名
+    var isVolume: Boolean = false,      // 是否是卷名
     var baseUrl: String = "",           // 用来拼接相对url
     var bookUrl: String = "",           // 书籍地址
     var index: Int = 0,                 // 章节序号
diff --git a/app/src/main/java/io/legado/app/data/entities/rule/ContentRule.kt b/app/src/main/java/io/legado/app/data/entities/rule/ContentRule.kt
index 4016c455e..4f881b2a3 100644
--- a/app/src/main/java/io/legado/app/data/entities/rule/ContentRule.kt
+++ b/app/src/main/java/io/legado/app/data/entities/rule/ContentRule.kt
@@ -11,5 +11,5 @@ data class ContentRule(
     var sourceRegex: String? = null,
     var replaceRegex: String? = null, //替换规则
     var imageStyle: String? = null,   //默认大小居中,FULL最大宽度
-    var payAction: String? = null,    //购买操作,url/js
+    var payAction: String? = null,    //购买操作,js或者包含{{js}}的url
 ) : Parcelable
\ No newline at end of file
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 20aeae31a..9fbc60561 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
@@ -460,6 +460,7 @@ class AnalyzeUrl(
      */
     suspend fun getByteArrayAwait(): ByteArray {
         val concurrentRecord = fetchStart()
+
         @Suppress("RegExpRedundantEscape")
         val dataUriFindResult = dataUriRegex.find(urlNoQuery)
         @Suppress("BlockingMethodInNonBlockingContext")
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
index 86d7c35ed..58ef70c39 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt
@@ -919,21 +919,15 @@ class ReadBookActivity : BaseReadBookActivity(),
             if (payAction.isNullOrEmpty()) {
                 throw NoStackTraceException("no pay action")
             }
-            if (payAction.isAbsUrl()) {
-                payAction
-            } else {
-                source.evalJS(payAction) {
-                    put("book", book)
-                    put("chapter", chapter)
-                }?.toString()
+            JsUtils.evalJs(payAction) {
+                it["book"] = book
+                it["chapter"] = chapter
             }
         }.onSuccess {
-            it?.let {
-                startActivity<WebViewActivity> {
-                    putExtra("title", getString(R.string.chapter_pay))
-                    putExtra("url", it)
-                    IntentData.put(it, ReadBook.bookSource?.getHeaderMap(true))
-                }
+            startActivity<WebViewActivity> {
+                putExtra("title", getString(R.string.chapter_pay))
+                putExtra("url", it)
+                IntentData.put(it, ReadBook.bookSource?.getHeaderMap(true))
             }
         }.onError {
             toastOnUi(it.localizedMessage)
diff --git a/app/src/main/java/io/legado/app/utils/JsUtils.kt b/app/src/main/java/io/legado/app/utils/JsUtils.kt
new file mode 100644
index 000000000..79a0701f5
--- /dev/null
+++ b/app/src/main/java/io/legado/app/utils/JsUtils.kt
@@ -0,0 +1,34 @@
+package io.legado.app.utils
+
+import io.legado.app.constant.AppConst.SCRIPT_ENGINE
+import io.legado.app.constant.AppPattern.EXP_PATTERN
+import javax.script.SimpleBindings
+
+object JsUtils {
+
+    fun evalJs(js: String, bindingsFun: ((SimpleBindings) -> Unit)? = null): String {
+        val bindings = SimpleBindings()
+        bindingsFun?.invoke(bindings)
+        if (js.contains("{{") && js.contains("}}")) {
+            val sb = StringBuffer()
+            val expMatcher = EXP_PATTERN.matcher(js)
+            while (expMatcher.find()) {
+                val result = expMatcher.group(1)?.let {
+                    SCRIPT_ENGINE.eval(it, bindings)
+                } ?: ""
+                if (result is String) {
+                    expMatcher.appendReplacement(sb, result)
+                } else if (result is Double && result % 1.0 == 0.0) {
+                    expMatcher.appendReplacement(sb, String.format("%.0f", result))
+                } else {
+                    expMatcher.appendReplacement(sb, result.toString())
+                }
+            }
+            expMatcher.appendTail(sb)
+            return sb.toString()
+        }
+        return SCRIPT_ENGINE.eval(js, bindings).toString()
+    }
+
+
+}
\ No newline at end of file