Summary of JavaScript data types

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js data types are mainly divided into basic data types and reference data types

Basic data The difference between types and reference data types:

Basic data types are references to values, while reference data types are references to addresses;

Basic data types are stored in stack memory , the stack memory provides an environment for JS code execution, and the reference data types are stored in the memory

The basic data types include:

Array array

string string

number number

beloon Boolean value

null

undefined

##Reference data types include:

Object data type

Function data type

Object data type is divided into: array[], object{}, regular RegExp, date object

The steps for storing object data types in memory:

1. Open up a new space address;

2. Put the keys in the object Values ​​are stored in this memory space;

3. Assign the space address to a variable name, pointing to the current space

The function data type consists of two parts:

1. Function definition phase Definition 3 steps

1) Open up a new space address

2) Put all the JS code in the function as The string is stored in this space

3) Assign the space address to the function name

2. The function call phase calls 2 steps

1) When the function is called A private scope will be formed

2) Execute the string in the previous heap memory as JS code

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