March 2012
Intermediate to advanced
244 pages
4h 42m
Chinese
Content preview from JavaScript 設計模式
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2
第一章
辨認出模式是很重要的，因為：
模式幫助我們使用前人已經驗證過的優良實踐方式，編寫出更好的程式碼，而不必
重新發明輪子。
模式提供了一定程度的抽象化概念 — 畢竟大腦一次就只能記住那麼幾件事，所以當
你在思考一個很複雜的問題時，模式可以幫助你不必被太過瑣碎的細節擾亂，因為
模式本身已經解釋了這些細節。
模式增強了開發者和團隊之間的溝通。開發者可能彼此遠在不同地方，難以面對面
溝通。將一些程式設計的技巧或者實踐方式取一個名字，可以更容易確定彼此是在
談論同一件事情。例如，與其說「這東西就是你用括號把函式包起來，然後在後面
加上另一組括號，好讓你在定義函式的地方就立刻執行」，不如說「立即函式」
（immediate function）來得更容易表達也更容易理解。
本書討論以下幾種模式：
設計模式（Design patterns）
編碼模式（Coding patterns）
反模式（Antipatterns）
設計模式一開始是在「四人幫」（Gang of Four）的經典書籍：物件導向設計模式：可再
利用物件導向軟體之要素（1994年出版）之中定義。本書的範例中包含了 singleton（單
體模式）、factory（工廠模式）、decorator（裝飾者模式）、observer（觀察者模式）和
其他模式。雖然設計模式的研究幾乎都使用強型別的語言，例如 C++ 和 Java ，實在沒什
麼道理使用像 JavaScript 這麼一個鬆散型別的動態語言來實踐設計模式。有時候這些
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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.