fix：年级不允许切换；

Reviewed-on: #154

src/renderer/src/components/choose-textbook/third/index.vue

@@ -1,7 +1,7 @@
 <template>
   <el-tabs v-model="active" class="demo-tabs" @tab-change="handleClick">
     <template v-for="(item,index) in gradeList" :key="index">
-      <el-tab-pane :label="item.label" :name="item.value">
+      <el-tab-pane :label="item.label" :name="item.value" disabled>
         <SelectSubject ref="selectSubject" :subjectList="subjectList" @clickTag="getTagId"></SelectSubject>
       </el-tab-pane>
     </template>
@@ -24,7 +24,9 @@ const active = ref(1)
 const subjectList = ref([])
 //用来获取学科的id
 const textbookVersionId = ref(0)
+//不需要切换年级教材了
 const handleClick = (tab) => {
+  console.log(tab,'tab')
   getSubject(tab)
 }
 //获取当前学段所有学科