我如何确保代码在严格的模式和松散的模式下以相同的方式工作?

I'm starting a new javascript application and would like to use strict mode. However, we will still have to support some older browsers (IE8,9) that don't support strict mode. Some of my co-workers are worried about the runtime semantics changes that come with strict mode -- they are concerned that strict functions will behave differently when run in lax mode on old browsers.I'm starting a new javascript application and w