在HTML5中进行iOS / Android开发，我们可以访问硬件吗？

We have to create an application for iPhone and Android as a school assignment. None of us have any experience with building an iPhone app. We want to create the app with HTML and Javascript. Is it possible to access the hardware using JavaScript? Do we have to build an Android and iPhone app apart from each other so we have another base to build on?We have to create an application for iPhone and