移动设备：
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width, height=device-height, , maximum-scale=1, minimum-scale=1, width=device-width, height=device-height, target-densitydpi=device-dpi" />
用户代理：
http://techpatterns.com/downloads/firefox/useragentswitcher.xml
NOSCRIPT:
<!-- <noscript><meta http-equiv="refresh" content="0;url=/noscript.html" /></noscript> -->
