January 2013
Intermediate to advanced
332 pages
5h 23m
Chinese
Content preview from JAVASCRIPT網頁應用程式設計
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第四章
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狀態機（State Machines）
狀態機—較專業的術語應該是
有限狀態機
（
Finite State Machines
，
簡稱
FSMs
）—是一
種開發 UI 的絕佳做法。只要善用狀態機，就能讓管理多組控制器、視情況需要顯示或
隱藏檢視器…等工作變得很容易。那麼，究竟狀態機是什麼意思？基本上，狀態機是由
兩項元素組成：狀態（state）和轉換函式（transition）。啟用的狀態永遠只會有一個，
停用的狀態則會有很多個。當我們將某個狀態設為停用，把另一個狀態設為啟用時，就
會觸發介於兩種狀態之間的轉換函式。
那我們該如何在實務上運用這樣的概念？假如你的應用程式裡有兩個需要獨立呈現的檢
視器（例如：顯示資料，和編輯資料的檢視器），而且這兩個檢視器永遠無法同時並存
時（當其中一個呈現顯示狀態，另一個就一定要被隱藏），就非常適合使用狀態機，因
為狀態機能確保同一時間內一定只會有一個啟用的狀態。而且如果日後想要新增其他的
檢視器（像是用來進行設定的檢視器），透過狀態機來處理也會非常的容易。
讓我們再舉個實際的範例，好讓你對狀態機的實作方式有更清楚的概念。雖然接下來這
段範例程式非常簡單，而且沒有用到不同的轉換類型，但已足以滿足我們的需求。首先
建立一組 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.