代码格式优化，去除多余的引入

src/pages/preview/components/previewCourse.vue

@@ -20,7 +20,7 @@
 </template>
 <script setup>
 	const status = ref('loading'); // loadmore - 加载前，loading - 加载中，nomore - 没有数据
-	const limit = 15;
+	const limit = 20;
 	const total = ref(-1);
 	const page = ref(0);
 	import common from '@/common/common';

src/pages/preview/index.vue

@@ -34,20 +34,11 @@
 	import PreviewAiSparring from './components/previewAiSparring.vue'
 	import PreviewCourse from './components/previewCourse.vue'
 	import {
-		reactive,
 		ref,
-		computed,
-		nextTick,
 		onMounted,
 		watch
 	} from 'vue';
-	import {
-		queryTraCrsBbsInfoByCrsId,
-		replyTraCrsBbsInfo,
-		qryChildTraCrsBbsInfo
-	} from '@/api/courseDetail.js';
 	import common from '@/common/common';
-	const statusBarHeight = uni.getSystemInfoSync().statusBarHeight;
 	import {
 		LineBg
 	} from '@/enum.js'