JavaScript问题解决方案全书：从基础到高级优化

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"Apress JavaScript Recipes" 是一本全面的JavaScript编程指南，专为解决常见和高级任务而设计。作为业界最受欢迎的客户端脚本语言，JavaScript在服务器端的应用也日益增加。本书采用问题-解决方案的方法，引导读者从基础概念入手，如内置对象和流程控制，深入探讨到高级优化技术、框架以及Node.js。作者 Russ Ferguson 和 Keith Cirkel 以其丰富的经验，将读者带入JavaScript的世界，通过实例驱动的方式，帮助读者迅速找到解决日常问题的有效策略和最佳实践。无论你是初学者还是进阶开发者，都能在书中找到适合自己的内容，了解JavaScript的所有潜力和特性。这本书不仅涵盖了JavaScript的核心语法，还涉及了如何利用其强大的DOM操作、异步编程、模块化管理、以及如何在浏览器和服务器环境中无缝协作。它还特别关注现代JavaScript生态系统，包括React、Angular、Vue等流行框架，以及Webpack这样的打包工具，以提升开发效率。对于性能优化，读者可以学习到代码压缩、缓存策略和避免内存泄漏等方面的技术。此外，对于Node.js环境，书中的内容会指导你如何构建服务器端应用，利用非阻塞I/O和事件驱动模型。 "Apress JavaScript Recipes" 的出版旨在为JavaScript开发者提供一个实用且全面的参考资源，确保他们在处理复杂项目时能得心应手。每一章都围绕实际问题展开，使读者能够在实践中学习和成长，提升自己的编程技能。这是一本不可多得的JavaScript编程实战手册，是任何想要精通此语言的程序员书架上不可或缺的一本书。

■ Contents

xvi

Evaluating an Expression Without a Return Value with the Void Operator �� 76

Problem �� 76

Solution��76

The Code �� 76

How It Works ��77

Determining the Type of a Variable with the typeof Operator �� 77

Problem �� 77

Solution��77

The Code �� 78

How It Works ��78

Using instanceof to Determine If a Variable Is an Instance of an Object �� 79

Problem �� 79

Solution��79

The Code �� 79

How It Works ��81

Finding Properties in an Object with the in Operator �� 81

Problem �� 81

Solution��81

The Code �� 82

How It Works ��83

Using Logical AND (&&) for Combining Boolean Expressions in an if Statement,

with Short-Circuit Evaluation �� 83

Problem �� 83

Solution��83

The Code �� 83

How It Works ��84

Using Logical OR (||) Short-Circuit Evaluation in an if Statement �� 84

Problem �� 84

Solution��84

The Code �� 85

How It Works ��86

■ Contents

xvii

Simplifying Variable Assignments Using the Conditional (?) Operator �� 86

Problem �� 86

Solution��86

The Code �� 86

How It Works ��87

Specifying Multiple Expressions Using the Comma Operator �� 88

Problem �� 88

Solution��88

The Code �� 88

How It Works ��89

■Chapter 3: Working with Strings �� 91

Understanding Unicode Strings �� 91

Problem �� 91

Solution��91

The Code �� 91

How It Works ��92

Using Special Characters (Escape Codes) in Strings�� 93

Problem �� 93

Solution��93

The Code �� 93

How It Works ��93

Comparing Two Strings for Equality �� 93

Problem �� 93

Solution��94

The Code �� 94

How It Works ��94

Determining a String’s Length �� 95

Problem �� 95

Solution��95

The Code �� 95

How It Works ��95

■ Contents

xviii

Concatenating Strings with the + Operator�� 96

Problem �� 96

Solution��96

The Code �� 96

How It Works ��96

Getting a Single Character from a String �� 97

Problem �� 97

Solution��97

The Code �� 97

How It Works ��97

Creating a String of UTF Character Code Units with fromCharCode( ) �� 98

Problem �� 98

Solution��98

The Code �� 98

How It Works ��99

Creating a String of UTF Code Points with fromCodePoint( ) �� 99

Problem �� 99

Solution��99

The Code �� 100

How It Works ��100

Getting a Single Character’s UTF Code Unit from a String with charCodeAt( ) �� 100

Problem �� 100

Solution��101

The Code �� 101

How It Works ��101

Getting a Single Character’s UTF Code Point from a string with codePointAt( ) �� 102

Problem �� 102

Solution��102

The Code �� 102

How It Works ��103

■ Contents

xix

Iterating Over a String’s code Units Using for��in �� 103

Problem �� 103

Solution��103

The Code �� 103

How It Works ��103

Iterating Over a String’s Code Points Using for��of�� 104

Problem �� 104

Solution��104

The Code �� 104

How It Works ��105

Repeating a String with repeat( ) �� 105

Problem �� 105

Solution��105

The Code �� 105

How It Works ��106

Determining If a String Contains a Smaller String Using contains( ) �� 106

Problem �� 106

Solution��106

The Code �� 106

How It Works ��107

Determining If a String Starts with a Smaller String using startsWith( ) �� 108

Problem �� 108

Solution��108

The Code �� 108

How It Works ��109

Determining If a String Ends with a Smaller String Using endsWith( ) �� 110

Problem �� 110

Solution��110

The Code �� 110

How It Works ��111

■ Contents

Finding the Index of an Occurring Substring with indexOf( ) �� 112

Problem �� 112

Solution��112

The Code �� 112

How It Works ��113

Finding the Index of the Last Occurrence of a Substring with lastIndexOf( ) �� 113

Problem �� 113

Solution��113

The Code �� 113

How It Works ��114

Finding Many Matches of a Substring with match( ) �� 114

Problem �� 114

Solution��114

The Code �� 115

How It Works ��115

Replacing Parts of a String with replace( ) �� 115

Problem �� 115

Solution��115

The Code �� 116

How It Works ��116

Searching a String Using a Regular Expression with search( ) �� 116

Problem �� 116

Solution��117

The Code �� 117

How It Works ��117

Getting a Substring Form a String with slice( ) �� 118

Problem �� 118

Solution��118

The Code �� 118

How It Works ��118

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