June 2014
Intermediate to advanced
488 pages
9h 56m
Chinese
Content preview from MOBILE HTML5學習手冊
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以行動與觸控設備為目標
|
395
每當使用者移動設備時，就會發生
deviceorientation
事件，包括特性：alpha（0-
360）、 beta（-90-90）與 gamma（-180-180），分別為設備繞著它的 z、x 與 y 軸旋轉的
數值。這些測量值通常與第一次定位的方向有關，因此
deviceorientation
適合測量相對
原始位置的移動方向。
設備狀態
設備在線上嗎？如果是，它使用哪一種網站連結類型？設備還有多少電力？我們不但可
以知道使用者怎樣拿設備，也可以判斷設備的狀態。
網路連結
Network API（
http://www.w3.org/TR/netinfo-api/
）公開了
navigator.connection.type
特性
與字串值
unknown
、
ethernet
、
wifi
、
2g
、
3g
、
4g
及
none
。有一些瀏覽器會回傳它們的整
數或常數值：
WIFI
、
CELL
、
CELL_3G
、
CELL_2G
、
CELL_4G
與
UNKNOWN
。這個 API 在第一次連
結時會回傳連結類型。但是設備並非永遠連到網路，連結類型也有可能改變。
較新的 API 會判斷連結的品質，而不是連結類型。因為所有電話公司都會吹噓他們的
連線，所以這種方式比邏輯性的歸納有意義多了。這個版本還沒有受到良好的支援，
但已經有一些瀏覽器支援它了。在較新的規格中，
navigator.connection
物件會公開
bandwidth
與
metered
屬性，與一個
change
事件。
如果是手機離線或未知，
navigator.connection.bandwidth ...
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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.