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                ## 六、Dispatcher Dispatcher 的作用是將 Action 派發到 Store、。你可以把它看作一個路由器,負責在 View 和 Store 之間,建立 Action 的正確傳遞路線。注意,Dispatcher 只能有一個,而且是全局的。 Facebook官方的?[Dispatcher 實現](https://github.com/facebook/flux)輸出一個類,你要寫一個[`AppDispatcher.js`](https://github.com/ruanyf/extremely-simple-flux-demo/blob/master/dispatcher/AppDispatcher.js),生成 Dispatcher 實例。 > ~~~ > // dispatcher/AppDispatcher.js > var Dispatcher = require('flux').Dispatcher; > module.exports = new Dispatcher(); > ~~~ `AppDispatcher.register()`方法用來登記各種Action的回調函數。 > ~~~ > // dispatcher/AppDispatcher.js > var ListStore = require('../stores/ListStore'); > > AppDispatcher.register(function (action) { > switch(action.actionType) { > case 'ADD_NEW_ITEM': > ListStore.addNewItemHandler(action.text); > ListStore.emitChange(); > break; > default: > // no op > } > }) > ~~~ 上面代碼中,Dispatcher收到`ADD_NEW_ITEM`動作,就會執行回調函數,對`ListStore`進行操作。 記住,Dispatcher 只用來派發 Action,不應該有其他邏輯。
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