1. 封裝導航欄自定義組件
   創建 nav-bar.vue

<script setup>import {onReady} from '@dcloudio/uni-app'import {ref} from 'vue';const props=defineProps(['navBackgroundColor'])const statusBarHeight = ref()const navHeight = ref()onReady(() => {uni.getSystemInfo({success: (e) => {statusBarHeight.value = e.statusBarHeightconst custom = uni.getMenuButtonBoundingClientRect()navHeight.value = custom.height + (custom.top - e.statusBarHeight) * 2}})})
</script>
<template><view :style="{'background-color': props.navBackgroundColor}"><view :style="{'height':statusBarHeight+'px'}"></view><view class="nav" :style="{'height':navHeight+'px'}"><view class="left"><slot name="left"></slot></view><view class="center"><slot name="center"></slot></view><view class="right"></view></view></view>
</template>
<style lang="scss" scoped>.nav {font-size: 30rpx;height: 100%;padding: 0 30rpx;display: flex;justify-content: space-between;align-items: center;.left {width: 100rpx;}.right {width: 100rpx;}}
</style>

2. 測試使用自定義導航

<script setup>
const back=()=>{console.log('back')
}
</script><template><nav-bar navBackgroundColor="#efefef"><template #left><text @click="back">返回</text></template><template #center style="color: red;">中間</template>	</nav-bar>
</template><style lang="scss" scoped></style>