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This article focuses on "what are the basic data types of JavaScript". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what are the basic data types of JavaScript"?

Digital (Number)

Integer or floating point number

Var numInt = 1tervar numFloat = 1.1

String

A string is a sequence of characters that represent text values

Var stringSingle = 'axiang' string string = 'abscmj'

Boolean value

True / false

Var t = true;var f = false

5 、 undefined

Undefined represents the attribute when the variable is undefined

Var x if (x = undefined) {console.log (1) / / 1} / / where var an is equivalent to var a = undefined

Null

A special keyword that indicates a null value

/ / foo does not exist, it has never been defined or initialized: foo; "ReferenceError: foo is not defined" / / foo is now known to exist, but it has no type or value: var foo = null; foo;null

The difference between undefined and null

/ / the type of data returned by typeof typeof null / / "object" (for some previous reason rather than 'null') typeof undefined / / "undefined"

Null means "no object", that is, there should be no value there.

Undefined means "missing value", which means there should be a value here, but it hasn't been defined yet.

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