March 2012
Intermediate to advanced
244 pages
4h 42m
Chinese
Content preview from JavaScript 設計模式
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48
第三章
對於較簡單的物件，你甚至不需要一個像
that
的區域變數，你可以只是回傳一個物件實
字，像這樣：
使用上述的實作
Waffle()
都一定會回傳一個物件，無論怎麼呼叫它：
這個模式的問題是失去了和原型間的連結，所以任何你加在
Waffle()
原型中的成員對於產
生的物件都沒有用。
注意：此變數命名為 that 只是一個慣例；這不是語言的一部分。你可以使用任何其他常用
的變數名稱，包括 self 和 me。
[45]
自我呼叫的建構式
為了解決前一個的模式的缺點，讓物件實體能使用原型的屬性，考慮以下的方法。在建構
式中檢查
this
是否為該建構式的實體，若不是的話，建構式就再次自我呼叫，這次要適
當的使用
new
。
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.