feat:增加任务只能建一个子项限制

@@ -94,7 +94,7 @@
     </el-form>
     <el-row :gutter="10" class="mb8">
       <el-col :span="1.5">
-        <el-button type="primary" plain icon="Plus" @click="handleAdd"
+        <el-button type="primary" :disabled="scanCodeDisabled" plain icon="Plus" @click="handleAdd"
           >扫码</el-button
         >
       </el-col>
@@ -317,7 +317,7 @@
 <script setup>
 import { getToken } from "@/utils/auth";
 import { formatDate } from "@/utils/index";
-import { nextTick, onMounted, onUnmounted, ref } from "vue";
+import { nextTick, onMounted, onUnmounted, ref,computed } from "vue";
 import {
   scanSpecQueryList,
   deviceTypeQueryList,
@@ -330,8 +330,6 @@ import {
   searchBusinessInfo,
 } from "@/api/system/scan";
 import { ElLoading } from "element-plus";
-import { da, fa } from "element-plus/es/locales.mjs";
-
 const router = useRouter();
 const route = useRoute();
 const { proxy } = getCurrentInstance();
@@ -411,6 +409,8 @@ const deviceTypeList = ref([]);
 
 const searchBusinessLoading = ref(false);
 
+const scanCodeDisabled = computed(() => dataList.value.length >= 1)
+
 const getDeviceTypeList = () => {
   deviceTypeQueryList(
     proxy.addDateRange(queryParams.value, dateRange.value)
@@ -473,7 +473,7 @@ function submitForm() {
       // });
 
       if (
-        dataList.value.length == 0 ||
+        dataList.value.length <= 1 ||
         form.value.businessId === dataList.value[0].businessId
       ) {
         const localStoreTableData = localStorage.getItem("localStoreTableData")