版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/knockout-postbox/0.6.1/knockout-postbox.js
- https://cdn.bootcdn.net/ajax/libs/knockout-postbox/0.6.1/knockout-postbox.min.js
A small library that uses Knockout's native pub/sub capabilities to facilitate decoupled communication between separate view models or components.