console 命令行工具 X clear

console

window.onresize=function(){
document.documentElement.style.fontSize  = document.documentElement.clientWidth/10+'px';
console.log(document.documentElement.clientWidth)
console.log(document.documentElement.style.fontSize)
}

<html>
    <div class="box"></div>
</html>

.box{
    width: 1rem;
    height: 1rem;
    background: red
}