很急求官方给回应
wxml：
<cover-view class="tab-bar">
  <cover-view class="tab-bar-border"></cover-view>
  <block wx:for="{{list}}" wx:key="index">
    <cover-view wx:if="{{index<3}}" class="tab-bar-item" data-path="{{item.pagePath}}" data-index="{{index}}" bindtap="switchTab">
      <cover-image src="{{selected === index ? item.selectedIconPath : item.iconPath}}"></cover-image>
      <cover-view style="color: {{selected === index ? selectedColor : color}}">
        {{item.text}}
      </cover-view>
    </cover-view>
    <block wx:else>
      <cover-view wx:if="{{hasUserInfo}}" class="tab-bar-item" data-path="{{item.pagePath}}" data-index="{{index}}" bindtap="switchTab">
        <cover-image src="{{selected === index ? item.selectedIconPath : item.iconPath}}"></cover-image>
        <cover-view style="color: {{selected === index ? selectedColor : color}}">
          {{item.text}}
        </cover-view>
      </cover-view>
      <button wx:else open-type="getUserInfo" bindgetuserinfo="bindGetUserInfo" hover-class="none" class="tab-bar-item" data-path="{{item.pagePath}}" data-index="{{index}}">
        <cover-image src="{{selected === index ? item.selectedIconPath : item.iconPath}}"></cover-image>
        <cover-view style="color: {{selected === index ? selectedColor : color}}">
          {{item.text}}
        </cover-view>
      </button>
    </block>
  </block>
</cover-view>
css:
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 48px;
  background: #181b24;
  padding: 4rpx 0 4rpx 0;
  display: flex;
  padding-bottom: env(safe-area-inset-bottom);
}

.tab-bar-border {
  background-color: rgba(0, 0, 0, 0.33);
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  transform: scaleY(0.5);
}

.tab-bar-item {
  flex: 1;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.tab-bar-item cover-image {
  width: 27px;
  height: 27px;
}

.tab-bar-item cover-view {
  font-size: 10px;
}

button wx-cover-view {
  line-height: 1.2;
}
/* 去除button默认样式 */

button {
  font-size: 0;
  background-color: transparent;
  border: none;
  padding: 0;
  margin: 0 0 0;
  border-radius: 0;
}

button::after {
  border: none;
}