为一个代码库提供非Retina和Retina显示器：用于在iPhone或iOS设备上扩展HTML5应用程序的布局和资产的框架？

Our goal is to emulate what developers can do with native iOS apps: that is, use a single layout, based on units, to accommodate Retina displays (640x960) and non-Retina displays (320x480).Our goal is to emulate what developers can do w