设备像素比devicePixelRatio简单介绍

http://www.zhangxinxu.com/wordpress/2012/08/window-devicepixelratio/

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var iScale = 1;         iScale = iScale/window.devicePixelRatio;         document.write('<meta name="viewport" content="width=device-width, initial-scale='+iScale+', maximum-scale='+iScale+', user-scalable='+iScale+'"');         var iWidth = document.documentElement.clientWidth/16;         document.getElementsByTagName('html')[0].style.fontSize = iWidth + 'px';         document.getElementsByTagName('body')[0].style.fontSize = iWidth + 'px';