JavaScript data types

First, typeof operator:

1.Undefined

2.String

3.Boolean

4.Number

5.Object

6.Function

Second, the return string:

1.undefined--Not defined

2.string--string

3.boolean--Boolean value

4.number--value

5.object--object or null

6.function--function

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Third, the Boolean type rule

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This article is from the Network system security blog, so be sure to keep this source http://8670519.blog.51cto.com/8660519/1901113

JavaScript Data type