Viewに登録したイベントが複数回呼ばれてしまう場合の対処 ref: http://qiita.com/matsukaz/items/8145f362a601176ae88f

file0.js

var AView = Backbone.View.extend({
    el: $("#main"),
    events: {
        "click button#btn1": "onBtn1Click"
    }
    ...
});
var BView = Backbone.View.extend({
    el: $("#main"),
    events: {
        "click button#btn1": "onBtn1Click"
    }
    ...
});

file1.js

this.off();
this.undelegateEvents();
this.remove();

file2.js

// Clears all callbacks previously bound to the view with `delegateEvents`.
// You usually don't need to use this, but may wish to if you have multiple
// Backbone views attached to the same DOM element.
undelegateEvents: function() {
    this.$el.off('.delegateEvents' + this.cid);
    return this;
},