bug fixes

src/pages/my/buyCourses.vue

 <template>
   <div class="main-container" v-show="loaded">
-    <ul v-if="list.length">
+    <ul v-if="dataList.length">
       <li class="order-item" v-for="(item, index) in dataList" :key="index">
         <div class="order-info">
           <div class="no-c"></div>