JavaScript新语(影印版)

无论你是否喜欢，JavaScript已经无处不在一一 从浏览器到服务器再到移动终端——而现在对于你而 言，也需要学习这门语言或者掌握更深的知识。这本 书将指导你进入JavaScript的世界。它由编程老手撰 写，他也曾经经历过相同的阶段。 劳施迈耶编著的《JavaScript新语》将通过四个 独立章节来帮助你掌握JavaScript。首先是快速指南 ，为你讲解足够的知识以帮助你在正确的道路上前行 。而更多有经验的JaVaScript编程人员则能在本书中 找到全面和易于阅读的深入涵盖各个语言特性的参者 知识。

Axel Rauschmayer士专长于JavaScript和web开发。他在2ality．com上撰写博客，是Ecmanauten公司的培训师，《JavaScript Weekly》周刊的编辑，并且管理着MunichJS用户组。Axel从1985年就开始编程，从1995开始开发web应用程序。

Preface Part Ⅰ. JavaScript Quick Start 1. Basic JavaScript Background Syntax Variables and Assignment Values Booleans Numbers Operators Strings Statements Functions Exception Handling Strict Mode Variable Scoping and Closures Objects and Constructors Arrays Regular Expressions Math Other Functionality of the Standard Library Part Ⅱ. Background 2. Why JavaScript? Is JavaScript Freely Available? Is JavaScript Elegant? Is JavaScript Useful? Does JavaScript Have Good Tools? Is JavaScript Fast Enough? Is JavaScript Widely Used? Does JavaScript Have a Future? Conclusion 3. The Nature oflavaScript Quirks and Unorthodox Features Elegant Parts Influences 4. How JavaScript Was Created 5. Standardization: ECMAScript 6. HistoricaIJavaScript Milestones PartⅢ. JavaScriptin Depth 7. JavaScript's Syntax An Overview of the Syntax Comments Expressions Versus Statements Control Flow Statements and Blocks Rules for Using Semicolons Legal Identifiers Invoking Methods on Number Literals Strict Mode 8. Values JavaScript's Type System Primitive Values Versus Objects Primitive Values Objects undefined and null Wrapper Objects for Primitives Type Coercion 9. Operators Operators and Objects Assignment Operators Equality Operators: === Versus = Ordering Operators The Plus Operator (+) Operators for Booleans and Numbers Special Operators Categorizing Values via typeof and instanceof Object Operators 10. Booleans Converting to Boolean Logical Operators Equality Operators, Ordering Operators The Function Boolean 11. Numbers Number Literals Converting to Number Special Number Values The Internal Representation of Numbers Handling Rounding Errors Integers in JavaScript Converting to Integer Arithmetic Operators Bitwise Operators The Function Number Number Constructor Properties Number Prototype Methods Functions for Numbers Sources for This Chapter 12. Strings String Literals Escaping in String Literals Character Access Converting to String Comparing Strings Concatenating Strings The Function String String Constructor Method String Instance Property length String Prototype Methods 13. Statements Declaring and Assigning Variables The Bodies of Loops and Conditionals Loops Conditionals The with Statement The debugger Statement 14. Exception Handling What Is Exception Handling? Exception Handling in ]avaScript Error Constructors Stack Traces Implementing Your Own Error Constructor 15. Functions The Three Roles of Functions in JavaScript Terminology: "Parameter" Versus '~Argument" Defining Functions Hoisting The Name of a Function Which Is Better: A Function Declaration or a Function Expression? More Control over Function Calls: call(), apply(), and bind() Handling Missing or Extra Parameters Named Parameters 16. Variables: Scopes, Environments, and Closures Declaring a Variable Background: Static Versus Dynamic Background: The Scope of a Variable Variables Are Function-Scoped Variable Declarations Are Hoisted Introducing a New Scope via an IIFE Global Variables The Global Object Environments: Managing Variables Closures: Functions Stay Connected to Their Birth Scopes 17. Objects and Inheritance Layer 1: Single Objects Converting Any Value to an Object this as an Implicit Parameter of Functions and Methods Layer 2: The Prototype Relationship Between Objects Iteration and Detection of Properties Best Practices: Iterating over Own Properties Accessors (Getters and Setters) Property Attributes and Property Descriptors Protecting Objects Layer 3: Constructors--Factories for Instances Data in Prototype Properties Keeping Data Private Layer 4: Inheritance Between Constructors Methods of All Objects Generic Methods: Borrowing Methods from Prototypes Pitfalls: Using an Object as a Map Cheat Sheet: Working with Objects 18. Arrays Overview Creating Arrays Array Indices length Holes in Arrays Array Constructor Method Array Prototype Methods Adding and Removing Elements (Destructive) Sorting and Reversing Elements (Destructive) Concatenating, Slicing, Joining (Nondestructive) Searching for Values (Nondestructive) Iteration (Nondestructive) Pitfall: Array-Like Objects Best Practices: Iterating over Arrays 19. Regular Expressions Regular Expression Syntax Unicode and Regular Expressions Creating a Regular Expression RegExp.prototype.test: Is There a Match? String.prototype.search: At What Index Is There a Match? RegExp.prototype.exec: Capture Groups String.prototype.match: Capture Groups or Return All Matching Substrings String.prototype.replace: Search and Replace Problems with the Flag/g Tips and Tricks Regular Expression Cheat Sheet 20. Dates The Date Constructor Date Constructor Methods Date Prototype Methods Date Time Formats Time Values: Dates as Milliseconds Since 1970-01-01 21. Math Math Properties Numerical Functions Trigonometric Functions Other Functions 22. JSON Background JSON.stringify(value, replacer?, space?) JSON.parse(text, reviver?) Transforming Data via Node Visitors 23. Standard Global Variables Constructors Error Constructors Nonconstructor Functions Dynamically Evaluating JavaScript Code via eval0 and new Function() The Console API Namespaces and Special Values 24. Unicode and lavaScript Unicode History Important Unicode Concepts Code Points Unicode Encodings JavaScript Source Code and Unicode JavaScript Strings and Unicode JavaScript Regular Expressions and Unicode 25. New in ECMAScript 5 New Features Syntactic Changes New Functionality in the Standard Library Tips for Working with Legacy Browsers Part Ⅳ. Tips, Tools, and Libraries 26. A Meta Code Style Guide Existing Style Guides General Tips Commonly Accepted Best Practices Controversial Rules Conclusion 27. Language Mechanisms for Debugging 28. Subclassing Built-ins Terminology Obstacle 1: Instances with Internal Properties Obstacle 2: A Constructor That Can't Be Called as a Function Another Solution: Delegation 29. JSDoc: Generating API Documentation The Basics of JSDoc Basic Tags Documenting Functions and Methods Inline Type Information ("Inline Doc Comments") Documenting Variables, Parameters, and Instance Properties Documenting Classes Other Useful Tags 30. Libraries Shims Versus Polyfills Four Language Libraries The ECMAScript Internationalization API Directories for JavaScript Resources 31. Module Systems and Package Managers Module Systems Package Managers Quick and Dirty Modules 32. More Tools 33. What to Do Next Index