Refactor JS plugin loading with constants

Introduced constants for JS file names and extensions to avoid repeated string literals. Improved plugin path loading and dependency configuration for better maintainability and clarity.

Author: AAChartModel

AAInfographics-ProDemo/Demo/AAPlugins/AAStageSeries/AACustomStageChartVC.swift

@@ -52,27 +52,36 @@ class AACustomStageChartVC: UIViewController {
          NSString *jsPath = [[NSBundle mainBundle] pathForResource:@"AADrilldown" ofType:@"js"];
          self.aaChartView.pluginsArray = @[jsPath];
          */
-        // 使用正确的Bundle路径和目录结构来加载JS文件
+        
+        // 定义JS文件名常量，避免重复拼写
+        let xrangeFileName = "AAXrange"
+        let customStageFileName = "AACustom-Stage"
+        let jsExtension = "js"
+        
+        // 使用正确的 Bundle 路径和目录结构来加载 AAXrange.js 文件
         let jsPathXrange: String = BundlePathLoader().path(
-            forResource: "AAXrange",
-            ofType: "js",
+            forResource: xrangeFileName,
+            ofType: jsExtension,
             inDirectory: "AAJSFiles.bundle/AAModules"
         ) ?? ""
 
-        // AACustom-Stage.js位于项目Demo目录中，使用Bundle.main加载
-        guard let jsPathCustom_Stage = Bundle.main.path(forResource: "AACustom-Stage", ofType: "js") else {
-            print("Error: Could not find AACustom-Stage.js")
+        // 使用 Bundle.main 加载位于项目 Demo 目录中的 AACustom-Stage.js 文件
+        guard let jsPathCustom_Stage = Bundle.main.path(forResource: customStageFileName, ofType: jsExtension) else {
+            print("Error: Could not find \(customStageFileName).\(jsExtension)")
             return
         }
 
+        // 配置需要加载的插件JS文件路径数组
         aaChartView.userPluginPaths = [
             jsPathXrange,
             jsPathCustom_Stage,
         ]
 
-        // 配置它们的依赖关系
+        // 配置它们的依赖关系 - 使用文件名常量构建完整文件名
+        //此处的依赖关系配置非常重要, 关系到 JS 插件的加载顺序
+        // 例如: AAXrange.js 必须在 AACustom-Stage.js 之前加载
         aaChartView.dependencies = [
-            AADependency("AACustom-Stage.js", on: "AAXrange.js"),
+            AADependency("\(customStageFileName).\(jsExtension)", on: "\(xrangeFileName).\(jsExtension)"),
             // 如果还有其他依赖, 继续在这里添加
             // AADependency("pluginC.js", on: "pluginA.js")
         ]