June 2014
Intermediate to advanced
488 pages
9h 56m
Chinese
Content preview from MOBILE HTML5學習手冊
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響應式 Web 的 CSS 功能
|
363
用戶端提示
目前
Client-Hints
還沒有被實作出來，甚至還在草案規格表單中。但是因為它們即將問
世，而且當它們出現時，將會是個非常棒的功能，所以我要在這裡介紹它。
Client-Hints
是瀏覽器連同請求標頭一起傳送給伺服器的提示。當它獲得支援之後，
預計會傳送三個值：
dpr
、
dw
與
dh
，代表設備像素比（device pixel ratio）、設備寬度
（device width）與設備高度（device height）：
Client-Hints: dh=1280, dw=768, dpr=2.0
瀏覽器將可以透過請求標頭來提示伺服器，接著伺服器可以根據瀏覽器規格來傳送最適
當的圖像大小。
這看起來有點像是使用者代理監聽（user-agent sniffing）：因為開發人員使用大量的 UA
監聽，瀏覽器製造商會加入彼此的字串，來互相支援，並忽略部署在無數個網站上面的
不完整 UA 監聽。預期
Client-Hints
不會有這種問題，因為沒有人會為了減少頻寬消耗
而謊報設備的高與寬。
363
364
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