JavaScript Number isNaN() method
- Ƙasa ɗanarorin isInteger()
- Ƙasa ɗanarorin isSafeInteger()
- Sakewa ɗanarorin Kita Manu JavaScript Number
Definition and usage
In JavaScriptNaN Is the abbreviation of "Not-a-Number".
In JavaScriptNaN It is an invalid number.
If the value is NaN and the type is Number Number.isNaN() Method returns true.
See also:
Example
Example 1
Check if the value is Number.NaN:
Number.isNaN(123);
Number.isNaN(-1.23);
Number.isNaN('123');
Number.isNaN(0/0);
Example 2
Number.isNaN(5-2);
Number.isNaN(0);
Number.isNaN('Hello');
Number.isNaN('2005/12/12');
Number.isNaN(' ');
Example 3
Check if the value is Number.NaN:
Number.isNaN(false);
Number.isNaN(true);
Number.isNaN(undefined);
Number.isNaN('NaN');
Number.isNaN(NaN);
Syntax
Number.isNaN(value)
Parameter
| Parameter | Description |
|---|---|
| value | Required. The value to be tested. |
Return value
| Type | Description |
|---|---|
| Boolean value. | If the value is Number.NaN true; otherwise false。 |
Difference between isnan() and Number.isnan()
IfValueIf it is not a number: isNaN() Method returns true。
IfNumberIf it is not a number: Number.isNaN() Return true。
In other words:isNaN() Before the test, convert the value to a number.
Example
isNaN('Hello'); // Return true
Number.isNaN('Hello'); // Return false
Browser daa yin
Number.isNaN() a jina ECMAScript6 (ES6) daa yin.
Alla browsers daa yin a daa yin ES6 (JavaScript 2015):
| Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|
| Chrome | Edge | Firefox | Safari | Opera |
| a daa yin | a daa yin | a daa yin | a daa yin | a daa yin |
Internet Explorer 11 (tana da kai ko ko tsa) ba a daa yin a girmi Number.isNaN()。
- Ƙasa ɗanarorin isInteger()
- Ƙasa ɗanarorin isSafeInteger()
- Sakewa ɗanarorin Kita Manu JavaScript Number
