JavaScript ---- Types

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本文深入介绍了JavaScript中的两种基本类型：原始类型（包括数字、字符串、布尔值、null和undefined）和对象类型。详细探讨了对象作为属性集合的概念，并列举了几种特殊的对象类型，如数组、函数及日期等。

1. JavaScript types can be divided into two categories:
1.1 primitive types
1.2 object types

2. JavaScript's primitive types include:
2.1 numbers
2.2 strings of text (known as strings)
2.3 Boolean truth values(known as booleans)
2.4 null and undefined

3. Any JavaScript value that is not a number, a string, a boolean, or null or undefined is an object.
An object(that is, a member of the type object) is a collection of properties where each property has a name and a value(either a primitive value, such as a number or string, or an object).
An ordinary JavaScript object is an unordered collection of named values.The language also defines a special kind of object, known as an array, that represents an ordered collection of numbered values.
JavaScript defines another special kind of object, known as a function. A function is an object that has executable code associated with it.

4. The Date class defines objects that represent dates.
The RegExp class defines objects that represent regular expressions.
The Error class defines objects that represent syntax and runtime errors that can occur in a JavaScript program.

5. Numbers, booleans, Strings, null, and undefined are immutable
Objects and arrays are mutable