chore: update

src/modules/student/lab/views/Index.vue

+<script setup lang="ts">
+import { HomeFilled, Select, UploadFilled, FullScreen } from '@element-plus/icons-vue'
+
+const LAB_URL = import.meta.env.VITE_LAB_URL
+
+let iframeKey = $ref(Date.now())
+// 返回首页
+function handleBackHome() {
+  iframeKey = Date.now()
+}
+</script>
+
 <template>
   <section class="lab">
     <div class="lab-left"></div>
     <div class="lab-right">
       <AppCard>
-        <el-button type="primary">返回首页</el-button>
-        <el-button type="primary">提交</el-button>
-        <el-button type="primary">上传报告</el-button>
-        <el-button type="primary">截图</el-button>
+        <el-row justify="space-between">
+          <el-button type="primary" :icon="HomeFilled" @click="handleBackHome">返回首页</el-button>
+          <div>
+            <el-button type="primary" :icon="Select">提交</el-button>
+            <el-button type="primary" :icon="UploadFilled">上传报告</el-button>
+            <el-button type="primary" :icon="FullScreen">截图</el-button>
+          </div>
+        </el-row>
       </AppCard>
       <AppCard>
-        <iframe
-          src="https://digitalmarketinglab.ezijing.com"
-          frameborder="0"
-          style="width: 100%; height: 70vh"
-        ></iframe>
+        <iframe :src="LAB_URL" :key="iframeKey" frameborder="0" style="width: 100%; height: 70vh"></iframe>
       </AppCard>
     </div>
   </section>