JavaScript Enlightenment 无水印pdf - CSDN文库

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Table of Contents

Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

1. JavaScript Objects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Creating Objects 1

JavaScript Constructors Construct and Return Object Instances 6

The JavaScript Native/Built-In Object Constructors 8

User-Defined/Non-Native Object Constructor Functions 9

Instantiating Constructors Using the new Operator 10

Creating Shorthand/Literal Values from Constructors 12

Primitive (a.k.a. Simple) Values 13

The Primitive Values null, undefined, “string”, 10, true, and false Are Not

Objects 15

How Primitive Values Are Stored/Copied in JavaScript 16

Primitive Values Are Equal by Value 17

The String, Number, and Boolean Primitive Values Act Like Objects When

Used Like Objects 18

Complex (a.k.a. Composite) Values 19

How Complex Values Are Stored/Copied in JavaScript 20

Complex Objects Are Equal by Reference 21

Complex Objects Have Dynamic Properties 22

The typeof Operator Used on Primitive and Complex Values 22

Dynamic Properties Allow for Mutable Objects 23

All Constructor Instances Have Constructor Properties that Point to Their

Constructor Function 24

Verify that an Object Is an Instance of a Particular Constructor Function 26

An Instance Created From a Constructor Can Have Its Own Independent

Properties (Instance Properties) 27

The Semantics of “JavaScript Objects” and “Object() Objects” 29

2. Working with Objects and Properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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