html页面字体自适应屏幕大小，根据屏幕宽度适应font-size文字大小

<script TYPE="text/javascript"> 	 

var docEl = document.documentElement;
function setRemUnit () {
    var rem = docEl.clientWidth / 19.2; // 可根据不同电脑分辨率进行手动修改（如1920*1080 为19.2
    docEl.style.fontSize = rem + 'px'
}

setRemUnit()

window.addEventListener('resize', setRemUnit)
window.addEventListener('pageshow', function (e) {
    if (e.persisted) {
        setRemUnit()
    }
})
</script>