uniapp使用vue3语法构建自定义导航栏，适配小程序胶囊

<template>
  <view class="custom-nav">
    <view class="nav-title">{{ title }}</view>
    <view class="nav-operations">
      <view class="nav-btn" @click="handleClick(1)">操作1</view>
      <view class="nav-btn" @click="handleClick(2)">操作2</view>
    </view>
  </view>
</template>
 
<script setup lang="ts">
import { ref } from 'vue';
 
const title = ref('自定义标题');
 
const handleClick = (type: number) => {
  switch (type) {
    case 1:
      // 操作1的逻辑
      console.log('操作1被点击');
      break;
    case 2:
      // 操作2的逻辑
      console.log('操作2被点击');
      break;
    default:
      break;
  }
};
</script>
 
<style scoped>
.custom-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px;
  background-color: #fff;
  position: relative;
  box-sizing: border-box;
}
.nav-title {
  font-size: 18px;
  font-weight: bold;
}
.nav-operations {
  display: flex;
  align-items: center;
}
.nav-btn {
  margin-left: 10px;
  padding: 5px 10px;
  border-radius: 5px;
  color: #fff;
  background-color: #007aff;
  cursor: pointer;
}
</style>

这段代码展示了如何在uniapp中使用Vue 3的Composition API和<script setup>语法来创建一个具有自定义标题和操作按钮的导航栏。同时，它也包含了样式代码，确保导航栏在不同平台上的兼容性和视觉效果。