The key is
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=320,maximum-scale=1.3,user-scalable=no">
</head>
<style type="text/css">
html{font-size:100px;}
body{font-size:0.14rem/*实际相当于14px*/}
@media(min-device-width:375px)and(max-device-width:667px)and(-webkit-min-device-pixel-ratio:2){
html{font-size:117.1875px;}
}
/*iphone6plus*/
@media(min-device-width:414px)and(max-device-width:736px)and(-webkit-min-device-pixel-ratio:3){
html{font-size:129.375px;}
}
</style>
<script type="text/javascript">
(function(doc,win){
var docEl=doc.documentElement,
resizeEvt="onorientationchange" in window ? "orientationchange" : "resize",
recalc=function(){
console.log(resizeEvt);
var clientWidth=docEl.clientWidth;
if(!clientWidth)return;
docEl.style.fontSize=100*(clientWidth/320)+'px';
};
//AbortifbrowserdoesnotsupportaddEventListener
if(!doc.addEventListener)return;
win.addEventListener(resizeEvt,recalc,false);
doc.addEventListener('DOMContentLoaded',recalc,false);
})(document,window);
</script>
<body>
hello
</body>
</html>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
