如何在使用$routeProvider时传递变量?

I'm using $routeProvider to create a one page app where users press continue to go to the next step. It is important to pass variables to the next page whenever a user clicks continue so I followed some advice and created my own service which has persistent variables. This all works great except that I can only get variables from the service, I don't know how to update the variables. Here is my code:I'm using $routeProvider to create a one page a