app/pages/goods/components/detail/detail-navbar.vue

<!-- 产品详情：产品/评价/详情的 nav -->
<template>
  <su-fixed alway :bgStyles="{ background: '#fff' }" :val="0" noNav opacity :placeholder="false">
    <su-status-bar />
    <view class="ui-bar ss-flex ss-col-center ss-row-between ss-p-x-20"
      :style="[{ height: sys_navBar - sys_statusBar + 'px' }]">
      <!-- 左 -->
      <view class="icon-box ss-flex">
        <view class="icon-button icon-button-left ss-flex ss-row-center" @tap="onClickLeft">
          <text class="sicon-back" v-if="hasHistory" />
          <text class="sicon-home" v-else />
        </view>
        <view class="line"></view>
        <view class="icon-button icon-button-right ss-flex ss-row-center" @tap="onClickRight">
          <text class="sicon-more" />
        </view>
      </view>
      <!-- 中 -->
      <view class="detail-tab-card ss-flex-1" :style="[{ opacity: state.tabOpacityVal }]">
        <view class="tab-box ss-flex ss-col-center ss-row-around">
          <view class="tab-item ss-flex-1 ss-flex ss-row-center ss-col-center" v-for="item in state.tabList"
            :key="item.value" @tap="onTab(item)">
            <view class="tab-title" :class="state.curTab === item.value ? 'cur-tab-title' : ''">
              {{ item.label }}
            </view>
            <view v-show="state.curTab === item.value" class="tab-line"></view>
          </view>
        </view>
      </view>
      <!-- #ifdef MP -->
      <view :style="[capsuleStyle]"></view>
      <!-- #endif -->
    </view>
  </su-fixed>
</template>

<script setup>
import { reactive } from 'vue';
import { onPageScroll } from '@dcloudio/uni-app';
import sheep from '@/sheep';
import throttle from '@/sheep/helper/throttle.js';
import { showMenuTools, closeMenuTools } from '@/sheep/hooks/useModal';

const sys_statusBar = sheep.$platform.device.statusBarHeight;
const sys_navBar = sheep.$platform.navbar;
const capsuleStyle = {
  width: sheep.$platform.capsule.width + 'px',
  height: sheep.$platform.capsule.height + 'px',
};

const state = reactive({
  tabOpacityVal: 0,
  curTab: 'goods',
  tabList: [
    {
      label: '产品',
      value: 'goods',
      to: 'detail-swiper-selector',
    },
    // {
    //   label: '评价',
    //   value: 'comment',
    //   to: 'detail-comment-selector',
    // },
    {
      label: '详情',
      value: 'detail',
      to: 'detail-content-selector',
    },
  ],
});
const emits = defineEmits(['clickLeft']);
const hasHistory = sheep.$router.hasHistory();

function onClickLeft() {
  if (hasHistory) {
    sheep.$router.back();
  } else {
    sheep.$router.go('/pages/index/index');
  }
  emits('clickLeft');
}

function onClickRight() {
  showMenuTools();
}

let commentCard = {
  top: 0,
  bottom: 0,
};

function getCommentCardNode() {
  return new Promise((res, rej) => {
    uni.createSelectorQuery()
      .select('.detail-comment-selector')
      .boundingClientRect((data) => {
        if (data) {
          commentCard.top = data.top;
          commentCard.bottom = data.top + data.height;
          res(data);
        } else {
          res(null);
        }
      })
      .exec();
  });
}

function onTab(tab) {
  let scrollTop = 0;
  if (tab.value === 'comment') {
    scrollTop = commentCard.top - sys_navBar + 1;
  } else if (tab.value === 'detail') {
    scrollTop = commentCard.bottom - sys_navBar + 1;
  }
  uni.pageScrollTo({
    scrollTop,
    duration: 200,
  });
}

onPageScroll((e) => {
  state.tabOpacityVal = e.scrollTop > sheep.$platform.navbar ? 1 : e.scrollTop * 0.01;
  if (commentCard.top === 0) {
    throttle(() => {
      getCommentCardNode();
    }, 50);
  }

  if (e.scrollTop < commentCard.top - sys_navBar) {
    state.curTab = 'goods';
  } else if (
    e.scrollTop >= commentCard.top - sys_navBar &&
    e.scrollTop <= commentCard.bottom - sys_navBar
  ) {
    state.curTab = 'comment';
  } else {
    state.curTab = 'detail';
  }
});
</script>

<style lang="scss" scoped>
.icon-box {
  box-shadow: 0px 0px 4rpx rgba(51, 51, 51, 0.08), 0px 4rpx 6rpx 2rpx rgba(102, 102, 102, 0.12);
  border-radius: 30rpx;
  width: 134rpx;
  height: 56rpx;
  margin-left: 8rpx;
  border: 1px solid rgba(#fff, 0.4);

  .line {
    width: 2rpx;
    height: 24rpx;
    background: #e5e5e7;
  }

  .sicon-back {
    font-size: 32rpx;
    color: #000;
  }

  .sicon-home {
    font-size: 32rpx;
    color: #000;
  }

  .sicon-more {
    font-size: 32rpx;
    color: #000;
  }

  .icon-button {
    width: 67rpx;
    height: 56rpx;

    &-left:hover {
      background: rgba(0, 0, 0, 0.16);
      border-radius: 30rpx 0px 0px 30rpx;
    }

    &-right:hover {
      background: rgba(0, 0, 0, 0.16);
      border-radius: 0px 30rpx 30rpx 0px;
    }
  }
}

.left-box {
  position: relative;
  width: 60rpx;
  height: 60rpx;
  display: flex;
  justify-content: center;
  align-items: center;

  .circle {
    position: absolute;
    left: 0;
    top: 0;
    width: 60rpx;
    height: 60rpx;
    background: rgba(#fff, 0.6);
    border: 1rpx solid #ebebeb;
    border-radius: 50%;
    box-sizing: border-box;
    z-index: -1;
  }
}

.right {
  position: relative;
  width: 60rpx;
  height: 60rpx;
  display: flex;
  justify-content: center;
  align-items: center;

  .circle {
    position: absolute;
    left: 0;
    top: 0;
    width: 60rpx;
    height: 60rpx;
    background: rgba(#ffffff, 0.6);
    border: 1rpx solid #ebebeb;
    box-sizing: border-box;
    border-radius: 50%;
    z-index: -1;
  }
}

.detail-tab-card {
  width: 50%;

  .tab-item {
    height: 80rpx;
    position: relative;
    z-index: 11;

    .tab-title {
      font-size: 30rpx;
    }

    .cur-tab-title {
      font-weight: $font-weight-bold;
    }

    .tab-line {
      width: 60rpx;
      height: 6rpx;
      border-radius: 6rpx;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      bottom: 10rpx;
      background-color: var(--ui-BG-Main);
      z-index: 12;
    }
  }
}
</style>