Backbone.js ListenToOnce被调用两次

I have a view (I'll call parent) that has another view inside of it ( a child view). The parent view has elements that use a "context menu" event (when right clicked, a set of menu options show up). When a user selects an item from the menu, it fires a callback. From there, I trigger an event in the child view. Here is my trigger:I have a view (I'll call parent) that has anoth