hotfix lottie lazt load

@@ -48,15 +48,14 @@ export default {
   },
   methods: {
     onScroll(pos) {
-      if (!this.$refs.scroll.pullDownRefresh) {
-        return;
-      }
-      if (this.$refs.scroll.beforePullDown) {
-        if (pos.y > 43) {
-          this.lottieBefore.goToAndStop(Math.abs(pos.y - 43) * 15);
+      if (this.lottieBefore && this.$refs.scroll.pullDownRefresh) {
+        if (this.$refs.scroll.beforePullDown) {
+          if (pos.y > 43) {
+            this.lottieBefore.goToAndStop(Math.abs(pos.y - 43) * 15);
+          }
+        } else {
+          this.lottieBefore.goToAndStop(0);
         }
-      } else {
-        this.lottieBefore.goToAndStop(0);
       }
       this.$emit('scroll', pos);
     },