jQuery快速指南：袖珍实用手册

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《jQuery袖珍参考手册》是由David Flanagan编写的权威指南，专为JavaScript开发者设计，特别是那些希望深入理解和快速掌握jQuery库的人。jQuery是一个流行的JavaScript库，它简化了HTML文档遍历、事件处理、动画和AJAX等功能，使得前端开发更为高效。该手册旨在提供简洁、实用的参考，帮助读者在日常工作中高效利用jQuery的各种功能。本书的核心内容包括但不限于以下几个知识点： 1. **jQuery基础知识**：介绍了jQuery的基本概念，如选择器语法、DOM操作（如元素查找、添加、删除等）、事件处理以及如何编写简化的JavaScript代码。 2. **DOM操作实践**：详细展示了如何使用jQuery来操作DOM树，如元素的遍历、属性操作、文本和样式管理等。 3. **动画和过渡**：jQuery的强大之处在于其动画功能，本书会涵盖如何创建平滑的动画效果，以及如何控制动画的速度、延迟和回调函数。 4. **Ajax交互**：jQuery简化了与服务器的异步通信，书中会讲解如何进行数据请求、处理响应以及实现AJAX交互的基本流程。 5. **插件和扩展**：jQuery拥有丰富的第三方插件生态系统，作者会介绍如何使用和自定义插件，提升开发效率。 6. **实用示例和案例**：书中包含大量的实例和实战项目，使读者能够在实际应用中理解和掌握jQuery的使用方法。 7. **版本兼容性和最佳实践**：随着版本迭代，jQuery可能引入新特性或调整API，手册会提供关于不同版本之间的差异和推荐的最佳实践。 8. **附录和索引**：为了方便查阅，手册通常会提供详细的索引，包括函数、方法、属性等，以及相关技术术语的解释。《jQuery Pocket Reference》是一本小巧但内容全面的参考书籍，对于任何想要精通jQuery并将其融入日常开发的Web开发者来说，都是不可或缺的参考资料。无论是在学习过程中还是解决实际问题时，这本书都能提供清晰、直观的指导。

Obtaining jQuery

The jQuery library is free software you can download from

http://jquery.com. Once you have the code, you can include it

in your web pages with a <script> tag:

At the time of this writing, the current version of jQuery is

1.4.4. The “min” in the filename above indicates that this is

the minimized version of the library, with unnecessary com-

ments and whitespace removed, and internal identifiers re-

placed with shorter ones.

Another way to use jQuery in your web applications is to allow

a content distribution network to serve it using a URL like one

of these:

http://code.jquery.com/jquery-1.4.4.min.js

http://ajax.microsoft.com/ajax/jquery/jquery-1.4.4.min.js

http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js

Replace the “1.4.4” version number in the URLs above as nec-

essary. If you use the Google CDN, you can use “1.4” to get

the latest release in the 1.4.x series, or just “1” to get the most

current release less than 2.0. The major advantage of loading

jQuery from well-known URLs like these is that because of

jQuery’s popularity, visitors to your website will likely already

have a copy of the library in their browser’s cache and no

download will be necessary.

The jQuery() Function

The jQuery() function (a.k.a. $()) is the most important one

in the jQuery library. It is heavily overloaded, however, and

there are four different ways you can invoke it.

The first and most common way to invoke $() is to pass a CSS

selector (a string) to it. When called this way, it returns the set

of elements from the current document that match the selector.

4 | Chapter 1: Introduction to jQuery

jQuery supports most of the CSS3 selector syntax, plus some

extensions of its own. Complete details of the jQuery selector

syntax are in “jQuery Selectors” on page 89. If you pass an

element or a jQuery object as the second argument to $(), it

returns only matching descendants of the specified element (or

elements). This optional second argument value defines the

starting point (or points) for the query and is often called the

context.

The second way to invoke $() is to pass it an Element, Docu-

ment, or Window object. Called like this, it simply wraps the

element, document, or window in a jQuery object and returns

that object, allowing you to use jQuery methods to manipulate

the element rather than using raw DOM methods. It is com-

mon to see jQuery programs call $(document) or $(this), for

example. jQuery objects can represent more than one element

in a document, and you can also pass an array of elements to

$(). In this case, the returned jQuery object represents the set

of elements in your array.

The third way to invoke $() is to pass it a string of HTML text.

When you do this, jQuery creates the HTML element (or ele-

ments) described by that text and then returns a jQuery object

representing those elements. jQuery does not automatically

insert the newly created elements into the document, but the

jQuery methods described in Chapter 3 allow you to easily in-

sert them where you want them. Note that you cannot pass

plain text when you invoke $() in this way, or jQuery will think

you are passing a CSS selector. For this style of invocation, the

string you pass to $() must include at least one HTML tag with

angle brackets.

When invoked in this third way, $() accepts an optional second

argument. You can pass a Document object to specify the

document with which the elements are to be associated. (If you

are creating elements to be inserted into an <iframe>, for ex-

ample, you’ll need to explicitly specify the Document object of

that frame.) Or, you can pass a second argument that specifies

the names and values of attributes to set on the newly created

elements as an object:

The jQuery() Function | 5

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