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多的不说了，直接看代码吧
<html lang="en">
<head>
<meta http-equiv = "X-UA-Compatible" content = "IE=edge,chrome=1" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-touch-fullscreen" content="YES" />
<script type="text/javascript">
var w = screen.width;
var rate = "0.55";
switch(w){
case 320:
case 640:
rate = "0.5";
break;
case 365:
case 720:
case 375:
case 750:
rate = "0.585";
break;
case 414:
case 1242:
case 1080:
rate = "0.64";
break;
default:
rate = "0.55";
break;
}
document.write("<meta name=‘viewport‘ content=‘width=device-width,initial-scale="+rate+", minimum-scale=0.2, maximum-scale=1, user-scalable=no‘>");
</script>
<meta charset="UTF-8">
<title>DEMO</title>
<!-- atwind | ChaosStudio http://cszi.com -->
<link rel="stylesheet" href="css/normalize.css">
。。。。
后面的就略掉了。
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原文地址：http://www.cnblogs.com/atwind/p/4265354.html
