WIP about deep cloning and Y axis and object sharing bug

src/views/Compare/Dashboard/index.vue

@@ -571,7 +571,8 @@ export default {
           break;
       }
       
-      return [primeVueSetData, primeVueSetOption]
+      // JSON.parse(JSON.stringify()) wouldn't work
+      return [primeVueSetData, primeVueSetOption];
     },
     /**
      * 建立長條圖