vue的style绑定background-image的方式和其他变量数据的区别详解

<tr v-for="(item,index) in dataObj">
 <td class="video-msg" v-bind:id="item.videoid">
  <div class="videoImg fl" v-bind:style="{backgroundImage:'url(' + item.videopic + ')'}">
  </div>
 </td>
 <td v-if="item.videoisdel == 3">审核中</td>
 <td>{{item.publishdate}}</td>
 <td>sss
  <button class="delete" @click='delConfirm(item.videoid)'>删除</button>
 </td>
</tr>

v-bind:style="{backgroundImage:'url(' + item.videopic + ')', backgroundRepeat:'no-repeat', backgroundPosition:'center center', backgroundSize: 'contain'}"