fix：答题多选至少选择一个选项！

src/components/examination/subject.vue

@@ -69,7 +69,7 @@
 						class="send_evaluate"
 						:custom-style="customStyle"
 						:throttleTime="300"
-						@click="muCheckbox('answer')"
+						@click="muBtnClick"
 						:hairline="false"
 					>
 						确定
@@ -112,6 +112,7 @@
 	import questionVue from './question.vue';
 	import { markIcon, feedbackIcon } from '@/common/imgSvg';
 	import { SUBJECT_TYPE } from '@/enum.js';
+	import common from '@/common/common';
 
 	// 多选的确定按钮的样式
 	const customStyle = {
@@ -295,6 +296,13 @@
 		}
 		modelValue.value = item_answer.value;
 	};
+	const muBtnClick = () => {
+		if(item_answer.value.length === 0){
+			common.msg('请至少选择一个选项！')
+			return
+		}
+		muCheckbox('answer')
+	}
 	const muCheckbox = (type = 'answer') => {
 		emit('subject_click', type, {
 			qnsTyp: props.item.qnsTyp,