移动端自适应

<script>

window.addEventListener('orientationchange', setRem);

window.addEventListener('resize', setRem);

setRem()

function setRem() {

    var html = document.querySelector('html');

    var width = html.getBoundingClientRect().width; //视口宽度

    html.style.fontSize = width / 16 + 'px'; //1rem = width / 16

}

</script>

<style>

@function rem($px){

  @return $px/46.875+rem

}

</style>