换算后 1rem == 1px；直接根据设计稿尺寸即可
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<link rel="icon" href="/favicon.ico">
<title>document</title>
</head>
<body style="max-width: 750px;">
<script>
function autoDpr() {
let Pixel = 750; // 设计稿宽度
let Dpr = 1;
let wWidth = document.documentElement.clientWidth;
if (window.devicePixelRatio) Dpr = window.devicePixelRatio;
if (wWidth > Pixel) wWidth = Pixel;
let size = (wWidth / Pixel);
document.querySelector('html').setAttribute('data-dpr', Dpr);
document.querySelector('html').setAttribute('style', "font-size:" + size + "px !important");
document.querySelector('body').setAttribute('style', 'margin:auto;max-width:' + Pixel + 'px !important')
}
autoDpr();
window.addEventListener('resize', autoDpr);
window.addEventListener('pageshow', autoDpr);
</script>
<div style="font-size: 14rem;">字体大小rem</div>
<div style="font-size: 14px;">字体大小px</div>
<div style="width: 375rem;height:100rem;background:#eee"></div>
<div style="width: 750rem;height:100rem;background:#444"></div>
</body>
</html>
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