更新 下载跟踪表逻辑及提示信息

src/views/voyage/voyageDetail.vue

@@ -1681,6 +1681,17 @@ async function calExpectedArrivalTime() {
 }
 let isLoadingExcel = ref(false);
 async function downloadExcel() {
+  if (
+    !voyage.value.arrivalLoadPortTime ||
+    !voyage.value.loadStartTime ||
+    !voyage.value.loadEndTime
+  ) {
+    ElMessage({
+      message: "航次尚未开航，无船舶跟踪信息",
+      type: "warning",
+    });
+    return;
+  }
   isLoadingExcel.value = true;
   let res = await downloadBlobFile(
     `${url.baseurl}/voyage/exportExcel`,