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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第七章
可以設定自訂表頭（像是
X-File-Name
）。好讓伺服器端能從表頭中取得這些資訊，並依
據這些資訊為檔案做些處理：
$.ajax({
url: "http://example.com",
type: "POST",
success: function(){ /* ... */ },
processData: false,
contentType: "multipart/form-data",
beforeSend: function(xhr, settings){
xhr.setRequestHeader("Cache-Control", "no-cache");
xhr.setRequestHeader("X-File-Name", file.fileName);
xhr.setRequestHeader("X-File-Size", file.fileSize);
},
data: file
});
但很不幸的，許多伺服器無法正確的處理這種上傳檔案的請求，因為相較於 multipart 或
URL 編碼過的表單參數，這種資料格式對伺服器來說比較陌生。如果一定要採用這種做
法，就得自行額外撰寫程式，解譯上傳檔案的請求。因此，我會比較建議使用
FormData
物件來發送
multipart/form-data
格式的上傳請求。本書的範例程式檔
assets/ch07/
jquery.upload.js
，是一套 jQuery 的外掛模組，它會幫你把上傳檔案的功能，抽象化成一
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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.