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How to use NaN attribute

不言Original: 2019-01-31 15:08:203561browse

The NaN attribute represents a "non-numeric" value. This attribute indicates that the value is not a legal number. The NaN attribute is the same as the Number.Nan attribute. In this article, we will introduce the basic usage of the NaN attribute.

Basic syntax of NaN attribute

Number.NaN

Now that we know the basic syntax of NaN attribute, let’s take a look at the usage of NaN attribute

Let’s look at a specific example

The code is as follows

<!DOCTYPE html>
<html>
   <head>
      <title></title>
   </head>
   <body> 
<script type="text/javascript">
var Month=30;
if (Month < 1 || Month > 12)
{
Month = Number.NaN;
}
document.write(Month);
</script>    
   </body>
</html>

The result displayed on the browser is: NaN

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