fix 选择先选择，再标记已读

src/features/SiteMessage/SiteMessageHome.vue

@@ -98,6 +98,14 @@ export default {
     async markRead() {
       // console.log(this.$refs.selection.getSelection());
       const selectIds = this.$refs.selection.getSelection().map(v => v.id);
+      if (selectIds.length === 0) {
+        this.$Message.warning({
+          content: "请先选择消息",
+          duration: 10,
+          closable: true,
+        });
+        return;
+      }
 
       await this.$http.post(
         "/api/ecs_exam_work/notice/updateNoticeReadStatus?noticeId=" +