<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<!--
<meta name="viewport" content="width=device-width,initial-scale=.33333,minimum-scale=.33333,maximum-scale=.33333" />
-->
<script>
//获取像素比
//console.log(window.devicePixelRatio);
var pixelRatio = 1 / window.devicePixelRatio;
console.log(pixelRatio);
//通过js动态设置视口(viewport)
document.write('<meta name="viewport" content="width=device-width,initial-scale='+pixelRatio+',minimum-scale='+pixelRatio+',maximum-scale='+pixelRatio+'" />');
</script>
</head>
<body>
</body>
</html>