update

src/views/live/teacher/group.vue

@@ -291,7 +291,11 @@ export default {
     sendAllMsg() {
       this.$prompt(' ', '给所有小组发送群消息', {
         confirmButtonText: '确定',
-        cancelButtonText: '取消'
+        cancelButtonText: '取消',
+        inputValidator(val) {
+          if (val !== null && val.length > 0) return true;
+          return '请输入内容';
+        }
       }).then(({ value }) => {
         SendGroupMessage({ task_id: this.task_id, group_message_text: value }).then(() => {
           this.$message.success('发送成功');