- window.devicePixelRatio获取像素密度
- dpr = 1/ devicePixo; 获取像素比
- 对meta进行缩放，缩放比例为dpr。（缩放后边线还原了1px,但是内容也被缩放了)
- 对内容缩放进行还原
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin:0;
padding: 0;
}
.box{
width:1rem;
height: 1rem;
/* width:100px;
height: 100px; */
background: red;
border: 1px solid blue;
}
</style>
</head>
<body>
<div class="box"></div>
<button id="resetMeta">还原meta</button>
</body>
</html>
<script>
function getDevicePixo (){
const devicePixo = window.devicePixelRatio;
const dpr = 1/ devicePixo;
const meta = document.querySelector("meta[name='viewport']");
meta.setAttribute('content','width=device-width, initial-scale='+dpr);
const fontsize = document.documentElement.clientWidth / dpr;
document.querySelector("html").style.fontSize=fontsize+'px'
return dpr;
}
window.onresize=function(){
console.log(getDevicePixo());
}
document.querySelector("#resetMeta").onclick=function(){
const meta = document.querySelector("meta[name='viewport']");
meta.setAttribute('content','width=device-width, initial-scale='+1);
}
</script>
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方法二 使用媒体查询 min-device-pixel-ratio
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| .border { border: 1px solid #999 }
@media screen and (-webkit-min-device-pixel-ratio: 2) {
.border { border: 0.5px solid #999 }
}
@media screen and (-webkit-min-device-pixel-ratio: 3) {
.border { border: 0.333333px solid #999 }
}
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原文：https://blog.csdn.net/aiyin9982/article/details/101685016
