Vue里v-forサイクル二層配列

    <div class="one" v-for="(item,index) in course_list" :key="index">
      <div class="banner">
        <div class="line" v-for="(rol, i) in item.college_list.slice(0,5)" :key="i">
          <img :src="rol.course_imgurl" alt />
          <div>{{rol.course_name}}div>
        div>
      div>
    div>

 <div class="line" v-for="(rol, i) in item.college_list.slice(0,5)" :key="i">