June 2014
Intermediate to advanced
488 pages
9h 56m
Chinese
Content preview from MOBILE HTML5學習手冊
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260
|
第九章
做法。你必須衡量程式維護與節省 HTTP 請求的好處，以及瀏覽器計算並繪製 CSS 圖
形花費的時間，及行動設備的記憶體限制。有一些 CSS 特效，例如非常大型的放射漸層
圖，會使用很多記憶體，而且如果你要求某個設備將它重複寫到記憶體裡面，會讓瀏覽
器變得很緩慢。
較少的程式，可能代表較佳的效能，與較輕鬆的網站維護過程。但是並非所有 CSS 功能
都可以在記憶體有限的設備上執行得很好。當我們討論“高風險”的 CSS 主題時，我會
解釋該功能對效能造成的影響，以及如何避免讓使用者的瀏覽器變慢或當機。
因為某些 CSS3 及 HTML5 功能有效能上的缺陷，我不會完全捨棄圖像不用。我們將會
在第十一章討論多重背景圖像與
border-image
，這是兩種可以快速且輕鬆使用圖像建立
按鈕與背景的功能。
我們不會討論語音、Paged Media 或 Ruby 模組，因為它們分別是讓聆聽語音的使用者、
印表機及亞洲語言網站使用的功能
1
。我們會在下一章討論變形、漸變及動畫。
雖然 CSS 方塊模型在 CSS3 之前就已經存在了，但我們也會花一些時間討論它。CSS 方
塊模型從 CSS 問世以來，就是網頁版面的基礎，所以你一定要充分地掌握它。
CSS 方塊模型特性
在我們進入新的 CSS3 特性與值之前，有一項很重要的事情，就是瞭解 CSS 方塊模
型，以及組成方塊模型的特性。所有現代瀏覽器一直以來都支援邊框（border）、邊界
（margin）及內距（padding）特性：
•
border-bottom ...
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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.