February 2012
Intermediate to advanced
540 pages
11h 39m
Chinese
Content preview from 深入淺出 jQuery
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目前位置 4 311
jQuery 與 Ajax
自我參照的函式
自我參照函式（self-referencing function）在其正常運作期間呼叫它自己。當你於再次執行它
之前必須等待當前執行結果出爐時，這樣的函式尤其有用。把setTimeout呼叫與這項機制結合
起來，你能夠將函式排程為只有在前一次呼叫成功時才會繼續執行，否則就不會到達程式碼當
中呼叫它自己的地方，因此它就不會再次被呼叫。
建 立 名 為 startAJAXcalls 的 函 式， 在 頁 面 載 入 時 被 呼 叫， 並 且 每 10 秒 呼 叫
getXMLRacers 函式。在指令稿檔案一開頭定義名為 FREQ 的變數，就在 $(document).
ready 函 式 裡， 並 且 以 毫 秒 為 單 位 設 定 它，作 為 表 示 反 覆 呼 叫 getXMLRacers 函式
之 頻 率 的 參 數。 使 用 setTimeout 呼 叫 startAJAXcalls 函 式， 讓 它 自 我 參 照， 就 在
getXMLRacers 函式完成之後。另外，你也需要直接在你的程式碼裡呼叫 startAJAXcalls
函式，以便啟動定時器。
$(document).ready(function(){
function startAJAXcalls(){
}
getXMLRacers();
function getXMLRacers(){
$.ajax({
url:
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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.