Update index.tsx

src/views/courseListSearch/index.tsx

@@ -52,7 +52,7 @@ export default defineComponent({
       return tempList;
     };
 
-    const formatSelectFirstChild = (list: any = []) => {
+    const formatSelectFirstChild = (list: any = []): any => {
       for(let i = 0; i < list.length; i++) {
         if(Array.isArray(list[i].materialList) && list[i].materialList.length > 0) {
           const materialItem = list[i].materialList[0] || {}