优化

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

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")

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -919,22 +919,16 @@ 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))
             }
-            }
         }.onError {
             toastOnUi(it.localizedMessage)
         }

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()
+    }
+
+
+}