更新！

src/main/java/com/github/microservice/models/statistics/SeriesModel.java

@@ -16,6 +16,8 @@ public class SeriesModel {
 
     private List<Object> data = new ArrayList<Object>();
 
+    private String type = "line";
+
     public void addSeries(Object series) {
         this.data.add(series);
     }