/** 设置 rem 函数 */
function setRem() {
  console.log(222223)
  const htmlWidth =
    document.documentElement.clientWidth || document.body.clientWidth
  const htmlDom = document.getElementsByTagName('html')[0]
  console.log(htmlWidth, htmlDom.style.fontSize)
  htmlDom.style.fontSize = htmlWidth / 100 + 'px'
}

setRem()

window.onresize = function () {
  setRem()
}