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Today, the editor will share with you the relevant knowledge of what nan refers to in jquery. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

In jquery, nan is the abbreviation of "Not a Number", which represents a special value that is not a numeric value, an undefined or inexpressible value; nan itself is a number type, which is used to indicate that the specified value is not a number. You can use the isNaN () method to determine whether a value is a number or not.

The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.

What does nan mean in jquery

The NaN attribute is a special value that represents non-numeric values. This property is used to indicate that a value is not a number. You can set the Number object to this value to indicate that it is not a numeric value.

IsNaN () global function to determine whether a value is a NaN value

Number.NaN is a special value that indicates that the result of some arithmetic operations, such as finding the square root of a negative number, is not a number. The methods parseInt () and parseFloat () return this value when the specified string cannot be parsed. For some functions that return valid numbers under normal circumstances, you can also use this method to explain its error condition with Number.NaN.

JavaScript outputs Number.NaN in the form of NaN. Note that the results of comparing NaN with other values are not always equal, including itself. Therefore, you cannot compare with Number.NaN to detect whether a value is a number, but can only call isNaN () to compare.

It's an abbreviation for not an number.

NaN indicates that it is not a number, but it itself is of type number.

NaN and NaN are not equal

Expansion

You can use isNaN to determine

Var num=3;window.isNaN (num)

The result is false.

IsNaN () this method determines whether a number is a number or not.

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