廖杰：修复预览模式的隧道切换bug和编辑模式的添加bug

src/components/content/tunnelScene/TunnelScene.vue

@@ -117,10 +117,10 @@ async function handleMounted() {
     demo.SignsInf(params.form.tunnelAlias, String(params.tunnelLength))
   } catch (err) {
     console.log(err);
-    // ElMessage({
-    //   message: "场景初始化异常---！",
-    //   type: "warning",
-    // });
+    ElMessage({
+      message: "场景初始化异常---！",
+      type: "warning",
+    });
   }
 }