How to realize subtraction in javascript

This article mainly shows you "how to achieve javascript subtraction", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to achieve javascript subtraction" this article.

1. NaN returns the Operand of NaN.

2. Positive infinity minus positive infinity returns NaN, other numbers (including negative infinity) return positive infinity, negative infinity minus infinity returns NaN, and other numbers (including positive infinity) return negative infinity.

3. It is not a number. It is calculated after Number (a) is called.

Example

Var a = "2"; var b = 3var num = Number (a); / / convert a string to a numeric if (isNaN (num)) {/ / conversion may fail, such as if an is not a numeric value. Console.log ('a non-numeric value');} else {/ / conversion is successful and the arithmetic operation can be performed. Console.log (aqb);} this is all the content of the article "how to subtract javascript". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!