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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第三章
不過它多了發送跨網域請求的功能。雖然它的介面和
XMLHttpRequest
相似，但在使用
上多了一些限制（
http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-
restrictions-limitations-and-workarounds.aspx
）。例如：只能使用GET 和 POST 兩種
傳輸方式、不支援認證或自訂表頭功能，以及最為人詬病的—只支援一種文件類型
「Content-Type: text/plain」。如果你願意忍受並自行克服這些限制，就可以在 IE 上使用
CORS（別忘了還得搭配正確的
Access-Control
表頭設定）。
JSONP
JSONP（JSON with padding 的簡稱，可參考：
http://bob.pythonmac.org/archives/2005/
12/05/remote-json-jsonp
）是在 CORS 尚未標準化之前，所推出的另一種擷取遠端伺服器
資料的技術。它的概念是利用一組 script 標籤指向某個 JSON 檔的網址，這個網址會回
傳一組函式呼叫，並在裡面包著一些資料。script 標籤裡面的網址不會有無法跨網域的
限制，而且這種做法幾乎可用於所有的瀏覽器。
舉例來說，我們可以先寫一個 script 標籤，讓它指向遠端伺服器：
<script src="http://example.com/data.json"> </script> ...
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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.