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JS data type

2021-08-08 00:54:01 Silent sunny day

JS Data type of

   mention JS Data type of , This should be JS The most basic knowledge of , But many beginners may not be clear JS What are the data types , Or it's not comprehensive enough , Some people say there is 6 Type of data , Some people say there is 7 Kind of . Today I want to summarize JS Data type of , I hope it can be helpful for beginners .

Question 1 :

  JS Which types of data can be divided into ?

answer :

  JS There are two types of data :1. Basic data type ,2. Reference data type

 

Question two :

  JS How many data types are there , What kind of ?

answer :

   stay ES5 When , The data types are 6 Kind of ( This is also the initial cognition of beginners ):

     Basic data type :String、Number、Boolean、Undefined、Null(5 Kind of )

     Reference data type :Object

   But according to the latest standards

  JS There are a total of 8 Kind of , They are

     Basic number data type :String、Number、Boolean、Undefined、Null、Symbol(ES6 newly added )、BigInt(ES2020 newly added )

     Reference data type :Object

     among ,

      Symbol yes ES6 A new data type , To put it simply : It is used to represent unique values

       and bigint( Large integer ) yes ES2020  A new data type introduced , This is a ECMAScript The eighth data type .BigInt It's only used to represent integers , There is no limit to the number of digits , An integer of any number of digits can be expressed exactly .

  

 


 

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