js部分:

  <van-slider v-model="value" range @drag="priceChange"  @drag-end="sliderDragEnd"  use-button-slot  max="1000" min="0" step="10">
                                  <view class="custom-button" slot="left-button">
                                    <view :class="dragActiveL?'custom-popover dragActive':'custom-popover'">
                                        {{ priceMin }}
                                        <view class="arrow-down"></view>
                                    </view>
                                  </view>
                                  <view class="custom-button" slot="right-button">
                                    <view :class="dragActiveR?'custom-popover dragActive':'custom-popover'">
                                        {{ priceMax }}
                                        <view class="arrow-down"></view>
                                    </view>
                                  </view>
                            </van-slider>

 css部分:

.custom-button {
    width: 26px;
    color: #fff;
    font-size: 10px;
    line-height: 18px;
    text-align: center;
    background-color: blue;
    border-radius: 100px;
}

.custom-popover {
    display: none;
    position: absolute;
    background: rgba(0, 0, 0,0.9);
    border: 1px solid rgba(0, 0, 0, 0.9);
    padding: 5px;
    border-radius: 5px;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.9);
    text-align: center;
    z-index: 9999;
    top: -40px;
    left: 50%; 
    transform: translateX(-50%); 
    min-width: 40px; 
    font-size: 14px; 
    color: #fff; 
  }
  .dragActive{
    display: block !important;
 }
  .arrow-down {
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid black; 
    position: absolute;
    bottom: -6px; 
    left: 50%;
    transform: translateX(-50%); 
    }
  .custom-button{
    position: relative;
    width: 26px !important;
    height: 26px !important;
    border-radius: 50% !important;
    background-color: #fff !important;
    box-shadow: 0 4px 8px 0 #dddddd, 0 6px 20px 0 #dddddd;
}