rem适配
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" /> <title></title> <style type="text/css"> *{ margin: 0; padding: 0; } #box{ width: 8rem; height: 8rem; background: deeppink; } </style> </head> <body> <div id="box"></div> </body> <script type="text/javascript"> //获取屏幕宽度 var width = document.documentElement.clientWidth; //获取html var htmlNode = document.querySelector('html'); //设置html字体大小 htmlNode.style.fontSize = width/16 + 'px'; </script> </html>