March 2012
Intermediate to advanced
244 pages
4h 42m
Chinese
Content preview from JavaScript 設計模式
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設計模式
163
如你所見，
validator
物件是泛用的，保持目前的樣子就足以應付所有檢驗的使用案例，
要增強它只需要新增更多檢查的類型。如果你在許多頁面都使用它來做驗證，很快的你就
可以擁有一整群很棒的特殊檢查。之後當你面對新的使用案例，只需要設定好驗證器並執
行
validate()
就大功告成了。
外觀模式（Façade）
Façade 是一種簡單的模式；它只是為其他物件提供一種替代的介面。保持方法簡短，是一
種很好的設計實踐方式，並且不要讓方法一次處理太多工作。按照這種實踐方式，你最終
將得到一組更大量的方法，這是相對於讓 uber（父物件）的方法帶有大量的參數。有的時
候某兩個或多個方法經常會一起呼叫，在這種情況，建立另一個方法來包裝這些重複出現
的方法呼叫頗有道理。
不需要驗證
歐喔
輔助方法
164
第七章
舉例來說，處理瀏覽器的事件時，你有下列方法：
stopPropagation()
困住事件，不讓它向上冒泡（傳遞）到父節點
preventDefault()
不允許瀏覽器進行預設動作（例如，前往一個連結或者提交一份表單）
它們是兩個單獨的方法，有著不同的目的，它們也應當保持獨立，但同時它們又經常一起
被呼叫。所以與其在整個應用中重複這兩個呼叫，你不如建立一個 façade 方法來一次呼叫 ...
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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.