物理畫素
阿新 • • 發佈:2020-08-11
<!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; border: 1px solid #000000; } </style> </head> <body> <div id="box"></div> </body> <script type="text/javascript"> var box = document.getElementById('box'); //獲取裝置畫素比 var dpr = window.devicePixelRatio; //比例 var scale = 1/dpr; //獲取螢幕寬度 375 var width = document.documentElement.clientWidth; //獲取meta標籤 var metaNode = document.querySelector('meta[name="viewport"]') metaNode.setAttribute('content','width=device-width,initial-scale='+ scale +',user-scalable=no') //元素比例乘回來 var htmlNode = document.querySelector('html'); htmlNode.style.fontSize = width/16*dpr + 'px'; </script> </html>