January 2013
Intermediate to advanced
332 pages
5h 23m
Chinese
Content preview from JAVASCRIPT網頁應用程式設計
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第二章
事件函式庫
在處理 JavaScript 的事件機制時，通常會需要使用一些現成的 JavaScript 函式庫，因為
如果不這麼做的話，就得自行處理數不清的瀏覽器相容性問題。接下來，本書將為你
介紹如何利用 jQuery 和事件機制相關的 API。當然，除了 jQuery 之外，其實還有其他
不錯的選擇，像是Prototype（
http://www.prototypejs.org
）、 MooTools（
http://mootools.
net
），以及 YUI（
http://developer.yahoo.com/yui
）。如果想更了解這些函式庫，可以參考
它們各自的 API 文件。
jQuery 的 API 中，有個
bind()
函式，可以建立能跨瀏覽器的事件監聽器。只要透過
jQuery 的物件實體來呼叫這個函式，並傳入兩組參數：事件名稱（eventName）、事件
處理器（handler）即可：
jQuery("#element").bind(eventName, handler);
如果想要在某個網頁元件上設定 click 事件處理器，可以這麼寫：
jQuery("#element").bind("click", function(event) {
// ...
});
jQuery 針對一些常見的事件類型（像是
click
、
submit
，和
mouseover
…等）提供快捷函
式。用法如下：
$("#myDiv").click(function(){
// ...
});
這裡要特別注意的是，在幫網頁元件設定事件之前，必須要確定該元件已經存在—也就 ...
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