如果你想使用JavaScript来利用当今强大的浏览器，本书为这个Web开发中奇妙且不可缺少的语言提供了完整而实际的指导。你将会学习从原始数据类型到复杂特性的所有内容，包括与Ajax和动态页面效果有关的JavaScript元素。学完这本书，你将能够使用最复杂的程序库和Web应用程序。本书包括了许多JavaScript运用中的最佳实践和范例，展示了如何将语言和浏览器环境整合，以及如何为符合标准的Web站点实践准确的编码技术。

如果你想使用JavaScript来利用当今强大的浏览器，《学习JavaScript》为这个Web开发中奇妙且不可缺少的语言提供了完整而实际的指导。你将会学习从原始数据类型到复杂特性的所有内容，包括与Ajax和动态页面效果有关的JavaScript元素。学完这本书，你将能够使用最复杂的程序库和Web应用程序。

第二版中包括了许多JavaScript运用中的最佳实践和范例，展示了如何将语言和浏览器环境整合，以及如何为符合标准的Web站点实践准确的编码技术。

有了这本书，你将能够：学习JavaScript应用程序结构，包括基本语句和控制结构；识别JavaScript对象：String、Number、Boolean、Function等；使用浏览器调试工具和故障检测技术；理解事件处理、表单事件和带有表单的JavaScript应用程序；使用浏览器对象模型（BOM）、文档对象模型（DOM）和自定义对象进行开发；学习关于浏览器cookies和更多最新的客户端存储技术；利用Ajax应用程序得到使用XML和JSON的详细信息。

《学习JavaScript》遵循已被证实的学习原理，帮助你以简单的步骤吸收这些原理，以使你理解如何在各种浏览器中建立强大且反应迅速的应用程序。

Preface

1. Hello JavaScript!

 Hello World!

　Hello World! Once Again

The script Tag

　　JavaScript Versus ECMAScript Versus JScript

　　Defining Functions in JavaScript

　　Event Handlers

　　The document Browser Object

　　The property Operator

　　The var Keyword and Scope

　　Statements

　　Comments

　　What You Didn't See: HTML Comments and CDATA Sections.

　JavaScript Files

　Accessibility and JavaScript Best Practices

Accessibility Guidelines

　　noscript

2. JavaScript Data Types and Variables

　Identifying Variables

　　Naming Guidelines

　Primitive Types

　The String Data Type

　　String Escape Sequences

　　String Encoding

　　Converting to Strings

　The Boolean Data Type

　The Number Data Type

　The null and undefined Variables

　Constants: Named but Not Variables

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

3. Operat0rs and Statements

 The Format of a JavaScript Statement

 The Assignment Statement

The Arithmetic Operators

The Unary Operators

Operator Precedence

A Handy Shortcut: Assignment with Operation

 The Bitwise Operators

 Conditional Statements and Program Flow

The if...else Conditional Statement

The switch Conditional Statement

 The Conditional Operators

The Equality and Identity (String Equality) Operators

Other Relational Operators

The One and Only JavaScript Ternary Operator

 The Logical Operators

 Advanced Statements: The Loops

The while Loop

The do...while Loop

The for Loops

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

4. The JavaScript Objects

 Primitive Data Types As Objects

 Boolean, Number, and String

The Boolean Object

The Number Object, Static Properties, and Instance Methods

　　The String Object

 Regular Expressions and RegExp

The RegExp Methods: test and exec

Working with Regular Expressions

 The Date Object

 The Math Object

The Math Properties

The Math Methods

 JavaScript Arrays

FIFO Queues

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

5. Functions

 Declarative Functions

Function Naming Conventions and Size

　　Function Returns and Arguments

 Anonymous Functions

 Function Literals

Functions and Recursion

Nested Functions, Function Closure, and Memory Leaks

Callback Functions

 Function Type Summary

 Function Scope

 Function As Object

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

6. Troubleshooting, Debugging, and Cross-Browser Issues

 Simple Ways to Debug

 Development and Debugging Tools by Browser

Firefox and Firebug

Using console.log

Firefox, the Web Developer Toolkit, and NoScript

Opera and Dragonfly

Safari/WebKit and the Web Inspector

Internet Explorer

 Dealing with Cross-Browser Differences

Object Detection

Where Object Detection Fails

DOCTYPE, X-UA-Compatible, and Quirks Mode

Breaking Backward Compatibility: The IE8 http-equiv Meta Tag

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

7. Catching Events

 The Events

 Level 0 Event Handling

　　The Event Object

　　Event Bubbling

　　Event Handlers and this

 The DOM Level 2 Event Model

　　Generating Events

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

8. Forms, Form Events, and Validation

 Attaching Events to Forms: Different Approaches

　　Cross-Browser Event Handling

　　Canceling an Event

 Selection

　　Dynamically Modifying the Selection

　　Selection and Auto-Selection

 Radio Buttons and Checkboxes

 The text, textarea, password, and hidden Input Elements

Text Validation

 Input Fields and Regular Expression Validation

 Forms, the Sandbox, and XSS

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

9. Browser As Puzzle Box

 The Structure of the Browser at a Glance

 The window Object

 Creating and Controlling Windows

　　The Dialogs: alert, confirm, and prompt

Creating Custom Windows

Modifying a Window

 Frames

The location Object

Remote Scripting with the iframe

 Adding and Controlling Timers

 The history, screen, and navigator Objects

The history Object

The screen Object

The navigator Object

The history, screen, and navigator Properties in Action

 The Document Object

Links

Images

 innerHTML

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

10. Cookies and Other Client-Side Storage Techniques

 The JavaScript Sandbox and Cookie Security

The Same-Origin Security Policy

Using document.domain

 All About Cookies

　　Storing and Reading Cookies

 Flash Shared Objects, Google Gears, and HTML5 DOM Storage

 Test Your Knowledge: Quiz

 Test Your Knowledge: Answers

11. The DOM, or Web Page As Tree

 A Tale of Two Interfaces

 The DOM HTML API

　　The DOM HTML Objects and Their Properties

　　DOM (HTML) Collections

 Understanding the DOM: The Core API

　　The DOM Tree

　　Node Properties and Methods

　　The DOM Core Document Object

 Element and Access in Context

　Modifying the Tree

　Test Your Knowledge: Quiz

　Test Your Knowledge: Answers

12. Dynamic Pages

　JavaScript, CSS, and the DOM

　　The Style Property/Attributes

　Fonts and Text

　　Font Style Properties

　　Text Properties

　Position and Movement

　　Dynamic Positioning

　　Drag-and-Drop

　Size and Clipping

　　Overflow and Dynamic Content

　　The Clipping Rectangle

　Display, Visibility, and Opacity

　　The Right Tool for the Right Effect

　　Just-in-Time Information

　Revisiting the DOM: Collapsing Forms, Query Selectors, and Class Names

　Test Your Knowledge: Quiz

　Test Your Knowledge: Answers

13. Creating Custom lavaScript Objects

　The JavaScript Object and Prototyping

　　Prototyping

　Creating Your Own Custom JavaScript Objects

　　Enter the Function

Public and Private Properties and Where this Enters the Picture

Getters and Setters

 Object Encapsulation

 Chaining Constructors and JavaScript Inheritance

 One-Off Objects

　Object Libraries: Packaging Your Objects for Reuse

 Advanced Error Handling Techniques (try, throw, catch)

 Test Your Knowledge: Quiz

　Test Your Knowledge: Answers

14. Moving Outside the Page with Ajax

　How Ajax Works

　Hello Ajax World!

　The XMLHttpRequest Object and Preparing to Send the Request

　　Object, Object, Who Has the Object?

　　The XMLHttpRequest Methods

　Processing the Web Request Return

　　Checking the readyState and status of an Ajax Request

　　Processing the Web Request Result

　Ajax: It's Not Only Code

　　The Dynamic Nature of Ajax

　　Ajax Accessibility and Degrading Gracefully

　　Security and Workarounds

　JavaScript and Ajax Libraries

　Test Your Knowledge: Quiz

　Test Your Knowledge: Answers

15. Ajax Data: XML oriSON?

　XML-Formatted Ajax Results

The Data's MIME Type

　　Generating the XML on the Server

　　Processing the XML on the Client

　JavaScript Object Notation

　　A Simple JSON Application

　　The JSON Object

　Test Your Knowledge: Quiz

　Test Your Knowledge: Answers

Index