學(xué)習(xí)JavaScript

前言

JavaScript was originally intended to be a scripting interface between a web page loadedin the browser client （Netscape Navigator at the time） and the application on the server.Since its introduction in 1995, JavaScript has become a key component of web devel-opment, and has found uses elsewhere as well.This book covers the JavaScript language, from its most primitive data types that havebeen around since the beginning of the language, to its most complex features, includ-ing those that have to do with Ajax and dynamic page effects. After reading this book,you will have the basics you need to work with even the most sophisticated librariesand web applications.AudienceReaders of this book should be familiar with web page technology, including CascadingStyle Sheets （CSS） and HTML/XHTML. Previous programming experience isn'trequired, though some sections may require extra review if you have no previousexposure to programming.This book should help:Anyone who wants, or needs, to integrate JavaScript into his own personal websiteor sitesAnyone who uses a content-management tool, such as a weblogging tool, andwants to better understand the scripting components incorporated into her tooltemplatesWeb developers who seek to integrate JavaScript and some of the dynamic webpage/Ajax features into their websitesWeb service developers who want to develop for a new market of clientsTeachers who use web technologies as either the focus or a component of theircourses

內(nèi)容概要

　　如果你想使用JavaScript來(lái)利用當(dāng)今強(qiáng)大的瀏覽器，《學(xué)習(xí)JavaScript》為這個(gè)Web開(kāi)發(fā)中奇妙且不可缺少的語(yǔ)言提供了完整而實(shí)際的指導(dǎo)。你將會(huì)學(xué)習(xí)從原始數(shù)據(jù)類型到復(fù)雜特性的所有內(nèi)容，包括與Ajax和動(dòng)態(tài)頁(yè)面效果有關(guān)的JavaScript元素。學(xué)完這本書(shū)，你將能夠使用最復(fù)雜的程序庫(kù)和Web應(yīng)用程序?！　〉诙嬷邪嗽S多JavaScript運(yùn)用中的最佳實(shí)踐和范例，展示了如何將語(yǔ)言和瀏覽器環(huán)境整合，以及如何為符合標(biāo)準(zhǔn)的Web站點(diǎn)實(shí)踐準(zhǔn)確的編碼技術(shù)?！　∮辛诉@本書(shū)，你將能夠：　　學(xué)習(xí)JavaScript應(yīng)用程序結(jié)構(gòu)，包括基本語(yǔ)句和控制結(jié)構(gòu)；　　識(shí)別JavaScript對(duì)象：String、Number、Boolean、Function等；　　使用瀏覽器調(diào)試工具和故障檢測(cè)技術(shù)；　  理解事件處理、表單事件和帶有表單的JavaScript應(yīng)用程序；　　使用瀏覽器對(duì)象模型（BOM）、文檔對(duì)象模型（DOM）和自定義對(duì)象進(jìn)行開(kāi)發(fā)；　　學(xué)習(xí)關(guān)于瀏覽器cookies和更多最新的客戶端存儲(chǔ)技術(shù)；　  利用Ajax應(yīng)用程序得到使用XML和JSON的詳細(xì)信息?！　　秾W(xué)習(xí)JavaScript》遵循已被證實(shí)的學(xué)習(xí)原理，幫助你以簡(jiǎn)單的步驟吸收這些原理，以使你理解如何在各種瀏覽器中建立強(qiáng)大且反應(yīng)迅速的應(yīng)用程序。

作者簡(jiǎn)介

作者：(美國(guó))Sbelley Powers

書(shū)籍目錄

Preface1. 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　　noscript2. 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: Answers3. 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: Answers4. 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: Answers5. 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: Answers6. 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: Answers7. 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: Answers8. 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: Answers9. 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: Answers10. 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: Answers11. 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: Answers12. 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: Answers13. 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: Answers14. 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: Answers15. 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: AnswersIndex

章節(jié)摘錄

插圖：Using the object property approach, you don't have to add event handlers as attributesinto element tags, but instead can add them into the JavaScript itself. We'll get intomore details on event handlers and more advanced forms of event handling beginningin Chapter 7. In the meantime, let's take a closer look at the document object.The document Browser ObjectExample 1-2, as small as it is, used one of the most powerful objects available in yourbrowser: the document object. The document object is, for all intents and purposes, arepresentation of the page, including all of the elements within it. It's through thedocument that we can access the page contents, and as you've just seen, it's through thedocument that we can also modify the page contents.The document has collections mapped to page elements, such as all the images or formelements in the page. It also has methods that you can use to both access and alter theweb page, including the open, writein, and dose methods used in Example 1-2.The open method opens the document for writing. In Example 1-2, the documentopened was the same document with which the script is contained. The writein methodis a variation of the write method, which outputs a string of text to the document. Theonly difference between write and writeln is that writein also appends a newline char-acter following the text. The dose method closes the document, and also forces theimmediate rendering of the document contents.An unfortunate consequence of writing to the existing document after the page is loadedis that the existing contents of the document are erased. That's why when you openthe page you'll see the "Hello, World！" message but you won't see the "Hi" that'salready in the page.

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