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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部署程式
|
167
# Response
HTTP/1.1 304 Not Modified
ETags 的值是依據一些每台伺服器都不相同的屬性值計算出來的—也就是說，即使是相
同的資源，放在兩台不同的伺服器就會得到兩組不同的 ETags 值。由於目前叢集架構
（cluster）已經越來越普遍，會讓這個問題變得很棘手。有鑑於此，我個人建議最好採
用
Last-Modified
，同時還要停用 ETags。
程式碼精簡工具（Minification）
JavaScript 程式的精簡工具，可以在不更動程式功能的前提下，去除 script 程式中不必
要的字元。像是空白字元、換行、註解…等等。比較好的精簡工具，甚至還可以解譯
JavaScript 的程式碼，並進而縮短變數和函式的名稱，去除更多不必要的字元數。對我
們而言，script 檔案自然是越小越好，因為這樣能讓網路傳輸資料量變得更少。
除了 JavaScript 檔案以外，CSS 和 HTML 檔案也可以用精簡工具處理一下。CSS 檔案裡
通常都會有相當多不必要的空白字元。精簡程式碼的動作，最好是等到程式部署階段再
進行，因為精簡過的程式碼，非常難以進行除錯。如果正式環境的程式碼在執行時不幸
發生錯誤，首要之務，就是要試著在開發環境重現相同的錯誤—這會讓除錯的工作變得
容易得多。
精簡程式碼還有一項附帶的好處：可以防止原始程式碼被竊取。當然啦，對於那些有心
要竊取原始程式碼的人，應該還是防不勝防。但好歹能提高一些難度，不至於讓你的心
血結晶，輕輕鬆鬆的就被人偷走。 ...
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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.