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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模型（Model）和資料
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如果想了解更多關於命名空間的資訊，建議你到 Peter Michaux 的部落格，裡面有一篇
非常棒的文章（
http://michaux.ca/articles/javascript-namespacing
）就是在介紹命名空間。
建立 ORM
物件- 關聯式對應（Object-relational mappers，或簡稱為ORMs），一般是用在
JavaScript 以外的程式語言上。不過，它是一種非常實用的資料管理技術，同時也會是
協助你將模型概念實際運用在 JavaScript 應用程式的絕佳利器。有了 ORM，就可以將模
型和遠端伺服器綁在一起—模型物件實體所發生的任何變動，都會透過背景程式將 Ajax
請求發送給伺服器。或著，也可以把模型物件實體和 HTML 網頁元件綁在在一起—模型
物件實體所發生的任何變動，都會反應至檢視器的內容。稍後將會再詳盡介紹上述兩種
做法的實際範例，首先先來說明，該如何建立 ORM 物件。
基本上，所謂的 ORM 指的是用來包裝某些資料的物件層程式介面。一般而言，ORM 的
用途是將 SQL 資料庫轉化為抽象的物件，但以我們現在的情形而言，ORM 只是用來將
JavaScript 資料型態轉化為抽象的物件。多包一層物件介面的好處，是能讓我們在這層
物件裡隨心所欲的加上自訂的函式和屬性，讓原先平凡無奇的基本資料，具備更多額外
的功能。我們可以藉此新增諸如資料驗證、觀察模型資料變動、儲存模型資料，以及伺
服器回叫…之類的功能，同時還能讓這些程式碼都可以被重複使用。 ...
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I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.