overrite method getFragment leaves a bug ?

[luqingxuan]

i have two pages:index & about,
enter browser my url and GO to about page:http://localhost:8888/#about
my backbone history config :

Backbone.history.start({
        root : '',
        pushState:false,
        hashChange : true
    }); 

so browser give me index page ,but not about page, why?
i notice that,u overrite class Backbone.Histroy.getFragment,
it leaves a bug,i think

oh , backbone use _usePushState for if condition, not _hasPushState