html font size change as the screen size is changed, the package function is as follows:
(function(){ 'use strict'; setRemUnit(); window.addEventListener('resize',setRemUnit); function setRemUnit(){ var docEl = document.documentElement; var ratio = 18.75; var viewWidth = docEl.getBoundingClientRect().width || window.innerWidth; docEl.style.fontSize = viewWidth / ratio + 'px'; } })();