使用angular和angular ui router，你可以修复这个问题

    app.config(function ($stateProvider, $urlRouterProvider, $locationProvider) {

      // Make a trailing slash optional for all routes
      // - Note: You'll need to specify all urls with a trailing slash if you use this method.
      $urlRouterProvider.rule(function ($injector, $location) {
        /***
        Angular misbehaves when the URL contains a "#_=_" hash.

        From Facebook:
          Change in Session Redirect Behavior
          This week, we started adding a fragment #_=_ to the redirect_uri when this field is left blank.
          Please ensure that your app can handle this behavior.

        Fix:
          http://stackoverflow.com/questions/7131909/facebook-callback-appends-to-return-url#answer-7297873
        ***/
        if ($location.hash() === '_=_'){
          $location.hash(null);
        }

        var path = $location.url();

        // check to see if the path already has a slash where it should be
        if (path[path.length - 1] === '/' || path.indexOf('/?') > -1) {
          return;
        }
        else if (path.indexOf('?') > -1) {
          $location.replace().path(path.replace('?', '/?'));
        }
        else {
          $location.replace().path(path + '/');
        }
      });

      // etc ...
    });
});

如果你使用的是带有hashbang (/#!/) url的JS框架，比如Angular，这可能会成为一个严重的问题。实际上，Angular会认为带有非hashbang片段的url是无效的，并抛出一个错误:

Error: Invalid url "http://example.com/#_=_", missing hash prefix "#!".

如果你在这种情况下(重定向到你的域根目录)，不要这样做:

window.location.hash = ''; // goes to /#, which is no better

简单地做:

window.location.hash = '!'; // goes to /#!, which allows Angular to take care of the rest

将此添加到我的重定向页面解决了我的问题…

if (window.location.href.indexOf('#_=_') > 0) {
    window.location = window.location.href.replace(/#.*/, '');
}

你也可以在Facebook回调的redirect_uri参数上指定你自己的散列，这在某些情况下可能是有帮助的，例如/api/account/callback#home。当你被重定向回来，它至少是一个哈希，对应于一个已知的路由，如果你使用backbone.js或类似的(不确定jquery移动)。

使用Angular 2 (RC5)和基于哈希的路由，我这样做:

const appRoutes: Routes = [
  ...
  {path: '_', redirectTo: '/facebookLoginSuccess'},
  ...
]

and

export const routing = RouterModule.forRoot(appRoutes, { useHash: true });

据我所知，路由中的=字符被解释为可选路由参数定义的一部分(见https://angular.io/docs/ts/latest/guide/router.html#!#optional-route-parameters)，因此不涉及路由匹配。

我使用这个，删除'#'符号。

<script type="text/javascript">
    if (window.location.hash && window.location.hash == '#_=_') {
        window.location.href = window.location.href.split('#_=_')[0];
    }
</script>