javascript-Basic data types

Basic data type:

Number: Contains integral and floating-point types, Nan not a number, which is of the number data type, Nan as long as comparison, Boolean value must be false

String:

Boolean:true/false

Null: Used to define an empty object

Undefined

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Reference data type object:

Array object:

Dictionary object:

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The basic data type differs from the reference data type:

The base data type is stored in the stack, the memory address of the reference data type is stored in the stack, and the referenced object is stored in the heap.

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Console.log (2==2) #true

Console.log (2== "2") #true

Console.log (2=== "2") #false

Compare two sides of a string if one is a number type and one is another, it converts its type to a numeric type

Compare strings on both sides of the string type, compare the highest bit ASCII code, if the highest bit is equal, continue to take the second bit comparison

javascript-Basic data types