获取浏览器窗口大小

function getHeight(){
  let height = document.documentElement.clientHeight  || document.body.clientHeight || window.innerHeight;
}

onMounted(()=>{
const handleResize=()=>{
  getHeight()
})
// 实时监听浏览器窗口大小
window.addEventListener('resize',getHeight)

window.addEventListener('resize',handleResize)


 // 注销监听器
      window.removeEventListener('resize', getHeight)