How to convert a string to a numeric value using Number () in JavaScript

This article mainly introduces how to use Number () to convert strings into numerical values in JavaScript, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

JavaScript Number () converts strings to numeric values

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

Strings that contain numbers (such as "3.14") are converted to numbers (such as 3.14).

The empty string is converted to 0.

Other strings are converted to NaN (Not a number, not numbers).

Number ("3.14") / / returns 3.14

Number ("") / / returns 0

Number ("") / / returns 0

Number ("99 88") / / returns NaN

Method description

ParseFloat () parses the string and returns a floating point number.

ParseInt () parses the string and returns an integer.

Unary + operator

The unary + operator can be used to convert variables into numbers:

Example

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

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

If the variable cannot be converted, it still becomes a number, but the value is NaN (Not a number):

Example

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

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

Thank you for reading this article carefully. I hope the article "how to use Number () to convert strings into numeric values in JavaScript" shared by the editor will be helpful to everyone. At the same time, I also hope that you will support and follow the industry information channel. More related knowledge is waiting for you to learn!