March 2012
Intermediate to advanced
244 pages
4h 42m
Chinese
Content preview from JavaScript 設計模式
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DOM 和瀏覽器的模式
203
這個
ttt
物件保有一份已填過的格子清單，儲存在
ttt.played
，並會傳送給伺服器，
這樣伺服器就可以回傳一個尚未填過的數值。若是有錯誤發生，伺服器的回應則會類似
這樣：
如你所見，JSONP 裡頭的回呼，必須是一個公開且可以全域存取的函式，倒不一定要是
全域函式，但可以是一個全域物件的方法。而若是沒有錯誤，伺服器回應的方法呼叫會類
似這個樣子：
這裡 3 的意思是伺服器選擇了編號 3 的格子。在這個案例中資料相當簡單，所以我們不需
要用 JSON 格式，一個值就足夠了。
頁框和 Image Beacons
頁框是另一種遠端操作的選擇。你可以用 JavaScript 建立一個
iframe
元素並變更其
src
的 URL。新的 URL 中可以包含資料和函式呼叫，並更新原呼叫者，也就是在
iframe
外
面的父頁面。
而 remote scripting 中最簡單的格式，會出現在當你需要的只是傳送資料給伺服器，而不需
要任何回應的時候。在這種情況，你可以建立一個新的圖片，並將它的
src
指向伺服器端
的 script：
這個模式稱為 image beacon，當你想要傳送資料讓伺服器記錄時很有用，例如，收集訪客
統計數據。因為回覆的 beacon對你來說毫無用處，一種常見但不好的作法是，讓伺服器回
覆一個 1x1 大小的 GIF 圖檔。更好的選擇是，回應「204 沒有內容」的 HTTP 回應。這意
思是送回給客戶端的只有標頭，但沒有內容主體。[19 ...
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