动态设置根节点字体大小

<script>

function setRem(){

var ui_w=" ";

//获取屏幕的宽度

var clieniwdth =document.documentElement.clientwidth || document.body.cli

console.log(ui_w,clientwidth);

//通过js动态改变html根节点字体大小

var html_=document.grtElementsByTagName('html')[0];

html_.style.fontsize=（clientWidth/ui_w）*100+'px';

//window.onresize =setRem;

</scri[pt>

}