npm i screenfull@5.1.0

创建vue组件，此组件可以导入到任何页面中，点击图标即可实现全屏/取消全屏操作，其中svg-icon是图标，您可以替换成您的图标

<template>
  <div @click="onToggle">
    <svg-icon :icon="isFullscreen ? 'exit-fullscreen' : 'fullscreen'" />
  </div>
</template>

<script setup>
import { ref, onMounted, onUnmounted } from 'vue'
import screenfull from 'screenfull'

// 是否全屏
const isFullscreen = ref(false)

// 监听变化
const change = () => {
  isFullscreen.value = screenfull.isFullscreen
}

// 切换事件
const onToggle = () => {
  screenfull.toggle()
}

// 设置侦听器
onMounted(() => {
  screenfull.on('change', change)
})

// 删除侦听器
onUnmounted(() => {
  screenfull.off('change', change)
})
</script>