app.vue
<template>
<!-- 子组件 -->
<button @click="add">add</button>
</template>
<script setup>
import {onMounted, ref} from 'vue'
const add = () => {
localStorage.setItem('tokens', '123456')
}
const demo = () => {
window.addEventListener('beforeunload', () => {
alert('页面关闭')
localStorage.removeItem('tokens')
})
}
onMounted(() => {
demo()
})
</script>
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