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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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.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.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.
控制器（Controller）和狀態
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75
Ajax 爬行規格（Ajax Crawling）
由於搜尋引擎爬行器（search engine crawlers）不會執行 JavaScript 程式，所以它們也看
不到任何透過 JavaScript 動態產生出來的網頁內容。此外，加在網址後面的雜湊也不會
被列入搜尋引擎的索引裡；因為對爬行器而言，它們全部都是相同的網址（雜湊分段資
訊，永遠不會被傳送至伺服器端）。
如果希望自己開發出來的 JavaScript 應用程式，能夠讓搜尋引擎（像 Google）找得到，
這就會是一個嚴重的問題。為了解決這個問題，有的程式設計師會為所有的網頁內容
建構一套「平行宇宙」。如果是搜尋引擎爬行器，就會被帶到一份特別為它準備的靜態
HTML 版本網頁，如果是一般的瀏覽器，就會被帶到正常版的 JavaScript 網頁應用程
式。不過這種做法會為程式設計師帶來許多額外的負擔，甚至還得自行處理瀏覽器識別
（browser sniffing，建議儘量避免做這樣的事）之類的工作。不過還好，目前 Google 已
經有提供了更好的替代方案，也就是所謂的 Ajax 程式爬行規格（
http://code.google.com/
web/ajaxcrawling/index.html
）。
再看一下我的 Twitter 專頁網址（這次請你特別注意驚歎號「！」的部分）：
http://twitter.com/#!/maccman
網址裡的驚歎號是在告訴 Google 的爬行器：「這個網站有遵循 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
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.