解决导航下图片不能按需加载的问题减少对资源请求数量

  <div class="page-navbar">  
    <!-- navbar -->  
    <mt-navbar class="page-part" v-model="selected" swipeable>  
      <mt-tab-item id="1">平台介绍</mt-tab-item>  
      <mt-tab-item id="2">雇佣模式</mt-tab-item>  
      <mt-tab-item id="3">3天试用</mt-tab-item>  
    </mt-navbar>   
  
    <!-- tabcontainer -->  
    <mt-tab-container v-model="selected" class="imgadapt">  
      <mt-tab-container-item id="1">  
      <div class="sprite1"></div>  
    
      </mt-tab-container-item>  
      <mt-tab-container-item id="2">
      <div class="sprite2"></div>  
      </mt-tab-container-item>  
      <mt-tab-container-item id="3">  
    
    <div class="sprite3"></div>  
      </mt-tab-container-item>  
    </mt-tab-container>  
  </div> 

.sprite1 {
    background: url(‘../assets/1.jpg‘) no-repeat;
    width: 5.25rem;
    height: 14.77rem;
    background-size:100% 100%;
    
}
.sprite2 {
    background: url(‘../assets/2.jpg‘) no-repeat ;
     width: 5.25rem;
    height: 14.77rem;
    background-size:100% 100%;
}
.sprite3 {
    background: url(‘../assets/3.jpg‘) no-repeat;
     width: 5.25rem;
    height: 14.77rem;
    background-size:100% 100%;
}