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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第四章
由於 Twitter 採用的轉址方式是暫時轉址（302）而非永久轉址（301），因此出現在搜尋
結果裡的網址，會是有加上雜湊值的版本（也就是動態 JavaScript 程式的版本：
http://
twitter.com/#!/maccman
）如果你的網址沒有準備靜態版本，至少也可以在伺服器接收
到帶有
_escaped_fragment_
參數的網址請求時，回傳一段 HTML 格式或純文字格式的
訊息。
在你實作了 Ajax 爬行規格之後，可以利用 Fetch as Googlebot 這套工具（
http://www.google.
com/support/webmasters/bin/answer.py?hl=en&answer=158587
）試驗一下。雖然不實作這
份規格，網頁仍然會被加進搜尋引擎的索引，但十之八九沒辦法以正確的型式呈現。不
過相信像 Google 這類的搜尋引擎，以後遲早會讓他們的爬行器具備解讀 JavaScript 程式
的能力，屆時就不需再用到這份爬行規格了。
使用 HTML5 的歷史瀏覽記錄 API
歷史瀏覽記錄 API（History API）是 HTML5 規格的一部分，它可以把瀏覽器目前網址
置換為任意網址。也可以在瀏覽器的歷史瀏覽記錄裡新增網址（讓程式能支援瀏覽器的
「上一頁」鈕）。這種做法和設定網址雜湊值一樣，重點都在於不讓瀏覽器重新載入網
頁—好讓我們能保留所有狀態。
目前各家瀏覽器的支援情形：
• Firefox >= 4.0
• Safari >= ...
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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.