Merge pull request 'fix : 修复bug' (#411) from dengjie into dev

Reviewed-on: http://git.feashow.cn/clay/tunnel-cloud-web/pulls/411

src/views/tunnel-simulate/index.vue

@@ -363,7 +363,7 @@ const initWebSocket = () => {
           socketData.windSpeed = data;
         }
         nextTick(() => {
-          previewRef.value.changePointValue(item)
+          previewRef.value?.changePointValue(item)
         })
       });
     }