off可以正常工作，下面的Router可以证明这一点：

var MyRouter = Backbone.Router.extend({
    routes: {
        'off': 'offAll',
        '*actions': 'index',

    },

    initialize: function(opt) {

        Backbone.history.on('all', this.all);
    },

    index: function() {
        console.log('route');

    },

    offAll: function() {
        console.log('offAll');

        // remove only this one listener
        Backbone.history.off('all', this.all);
    },

    all: function(){
        console.log('all test');
    }

});

导航到#/off以外的任何位置时，将显示：

route
all test

然后，导航到#/off将显示：

offAll

然后，all test永远不会出现。

Backbone 网的事件.off函数

// Removes just the `onChange` callback.
object.off("change", onChange);

// Removes all "change" callbacks.
object.off("change");

// Removes the `onChange` callback for all events.
object.off(null, onChange);

// Removes all callbacks for `context` for all events.
object.off(null, null, context);

// Removes all callbacks on `object`.
object.off();