code: protected String getCommonValueFile(HttpServletRequest hq, HttpServletResponse response)
  	{
  		String common =  base+"/common.var";
  		if(gt.getResourceLoader().exist(common)){
  			return common;
  		}else{
  			return null;
  		}
  	}
docs: 得出公用的脚本文件，默认是在在webroot目录下的/values/common.var
  @param hq
  @param response
  @return