加上如下js，px转换成rem需要手动，计算方式：量的大小除以100，就等于rem，例如：量的设计稿元素宽度是120，那么就写成{ 1.2rem}，这样写有什么问题，待研究，也欢迎补充
<!DOCTYPE html> <html lang="en" style="font-size:100px"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script> function resetFontSize() { var baseFontSize = 100 var designWidth = 750 var width = window.innerWidth var currentFontSize = (width / designWidth) * baseFontSize document.getElementsByTagName('html')[0].style.fontSize = currentFontSize + 'px' } window.onresize = function () { resetFontSize() }; resetFontSize() </script> <style> *{ padding:0; margin:0; } body{ overflow: auto; font-size: .28rem; } .box{ width:7.5rem; height: 1rem; background: #000; } </style> </head> <body> <div class="box"></div> <p>42341</p> </body> </html>