xiangyuan-collect-web/src/components/MobileNav.vue

<template>
  <nav class="main mobile">
    <button v-if="canGoBack" @click="router.back()">
      <IconBack />
    </button>
    <span>{{ title }}</span>
    <span class="button-placeholder"></span>
  </nav>
</template>

<script setup lang="ts">
import { computed } from 'vue';
import { useRouter } from 'vue-router'
import IconBack from './icons/IconBack.vue';
const router = useRouter();
const canGoBack = computed(() => router.currentRoute.value.name !== 'Home');

defineProps({
  title: {
    type: String,
    default: '',
  },
})
</script>

<style lang="scss">
@use '@/assets/scss/colors.scss' as *;

$nav-height: 44px;

nav.main.mobile {
  position: fixed;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  width: 100%;
  height: $nav-height;
  padding: 0;
  background-color: $primary-color;
  border-bottom: 1px solid rgba(#fff, 0.2);
  color: #fff;
  transition: all ease-in-out 0.3s;

  button {
    width: $nav-height;
    height: $nav-height;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    background-color: transparent;
    outline: none;
    border: none;

    &:hover {
      background-color: rgba(#fff, 0.2);
    }

    svg {
      width: 25px;
      height: 25px;
      fill: currentColor;
    }
  }
  .button-placeholder {
    width: $nav-height;
  }
}

main.mobile-nav {
  .nav-placeholder {
    height: $nav-height; 
    background-color: $primary-color;
  }
}

</style>