style:优化代码格式和样式

- 调整 van-icon 组件的闭合方式，提高代码可读性
- 修正 CSS 选择器的子元素选择符，统一代码风格

src/views/Design/components/Questions/MartrixQuestion.vue

@@ -30,20 +30,20 @@ const handleAdd = (addType: 'row' | 'col') => {
 
 const handleMartrixAction = (action: 'delete' | 'setting' | 'more') => {
   switch (action) {
-  //   case 'delete':
-  // showConfirmDialog({
-  //   title: '提示',
-  //   message: '是否确认删除题目？'
-  // }).then(() => {
-  //   element.list = [];
-  // });
-  // break;
-  // case 'setting':
-  //     break;
-  // case 'more':
-  //     break;
-  default:
-    break;
+    //   case 'delete':
+    // showConfirmDialog({
+    //   title: '提示',
+    //   message: '是否确认删除题目？'
+    // }).then(() => {
+    //   element.list = [];
+    // });
+    // break;
+    // case 'setting':
+    //     break;
+    // case 'more':
+    //     break;
+    default:
+      break;
   }
 };
 </script>
@@ -79,17 +79,14 @@ const handleMartrixAction = (action: 'delete' | 'setting' | 'more') => {
             <span @click="handleAdd('col')"> <van-icon name="add-o" />添加列标签</span>
           </van-col>
           <van-col :span="6" :offset="6" class="martrix-table-action-tool">
-            <span @click="handleMartrixAction('delete')"> <van-icon
-              name="delete"
-              style="color: red;"
+            <span @click="handleMartrixAction('delete')">
+              <van-icon name="delete" style="color: red"
             /></span>
-            <span @click="handleMartrixAction('setting')"> <van-icon
-              name="setting"
-              style="color: lightgrey;"
+            <span @click="handleMartrixAction('setting')">
+              <van-icon name="setting" style="color: lightgrey"
             /></span>
-            <span @click="handleMartrixAction('more')"> <van-icon
-              name="ellipsis"
-              style="color: lightgrey;"
+            <span @click="handleMartrixAction('more')">
+              <van-icon name="ellipsis" style="color: lightgrey"
             /></span>
           </van-col>
         </van-row>
@@ -110,7 +107,6 @@ const handleMartrixAction = (action: 'delete' | 'setting' | 'more') => {
     border-width: 0 0 1px;
     text-align: left;
   }
-
 }
 
 .martrix-table-action {
@@ -125,10 +121,10 @@ const handleMartrixAction = (action: 'delete' | 'setting' | 'more') => {
     display: flex;
     justify-content: flex-end;
 
-    &>span {
+    & > span {
       margin-right: 6px;
       font-size: 16px;
     }
   }
 }
-</style>
+</style>