enhancement #I62DT1 如果对上下文标注@ScriptBean，那么脚本和java中拿到的上下文并不是同一个上下文

liteflow-script-plugin/liteflow-script-javascript/src/main/java/com/yomahub/liteflow/script/javascript/JavaScriptExecutor.java

@@ -87,7 +87,8 @@ public class JavaScriptExecutor implements ScriptExecutor {
             bindings.put("_meta", metaMap);
 
             //放入用户自己定义的bean
-            bindings.putAll(ScriptBeanManager.getScriptBeanMap());
+            //放入用户自己定义的bean
+            ScriptBeanManager.getScriptBeanMap().forEach(bindings::putIfAbsent);
 
             return compiledScript.eval(bindings);
         }catch (Exception e){