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This article mainly introduces the relevant knowledge of how to use the JavaScript unary operator, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe you will gain something after reading this article on how to use the JavaScript unary operator. Let's take a look at it.

Unary operator +

Operator+ can be used to convert variables to numbers:

Example

Var y = "5"; / / y is a string

Var x = + y; / / x is a number

If the variable cannot be converted, it will still be a number, but the value will be NaN (not a number):

Example

Var y = "John"; / / y is a string

Var x = + y; / / x is a number (NaN)

Convert a Boolean value to a number

The global method Number () converts a Boolean value to a number.

Number (false) / / returns 0

Number (true) / / returns 1

Convert a date to a number

The global method Number () converts a date to a number.

D = new Date ()

Number (d) / / returns 1404568027739

The date method getTime () has the same effect.

D = new Date ()

D.getTime () / / returns 1404568027739

This is the end of the article on "how to use the JavaScript unary operator". Thank you for reading! I believe you all have a certain understanding of the knowledge of "how to use the JavaScript unary operator". If you want to learn more, you are welcome to follow the industry information channel.

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