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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MVC 和類別（Classes）
|
7
由此可見，開發控制器時並不需要使用函式庫或框架平台（framework）。不過得要將控
制器、模型、檢視器三者之間的權責切割乾淨，才能正確的呈現 MVC 架構。本書第四
章會更詳盡的說明控制器和狀態的概念。
邁向模組化的第一步：建立類別
在觸及 MVC 的核心之前，本書首先要介紹一些基本概念，像是 JavaScript 的類別
（class）和事件（event）。先打好紮實的基礎，稍後學習進階概念時才能更得心應手。
如果只是想建立一個用來儲存靜態資料的類別，JavaScript 的物件實字（object literal）
就足以滿足我們的需求。但我們通常還會需要建立一個可以繼承、可以建立實體的
標準類別。在此需要先鄭重聲明一點，由於 JavaScript 是一種原型語言（prototype
language），因此它本身並沒有提供建立類別的機制。不過，其實我們可以透過一些其他
的手法，輕易的達到和建立類別相同效果的目的。
不少人認為在 JavaScript 程式裡使用類別似乎不符合「JavaScript 精神」（不過我認為這
個詞基本上一點意義也沒有）。如果你是選用 jQuery 函式庫來開發 JavaScript 程式，就
會發現 jQuery 對於該選用哪種架構方法論或繼承模式，是保持著非常中立的立場。這讓
JavaScript 程式設計師誤以為他們不應該考慮程式架構（因為他們會認為 JavaScript 沒
有類別這樣的機制，或是不該使用類別機制）。但事實上 ...
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