Javascript Nan attributes

ArticleDirectory

• Syntax
• Description

Definition and usage

The Nan attribute is used to reference special non-numeric values.

Syntax

Nan

Description

You cannot use the for/in loop to enumerate the Nan attribute, or use the delete operator to delete it.

Nan is not a constant. You can set it to another value.

Tips and comments

Tip:Use isnan () to determine whether a value is a number. The reason is that Nan is not equal to all values, including itself.

Instance

In this example, we will show when a number exceeds the Infinity limit:

<SCRIPT type = "text/JavaScript"> var test1 = "300" Var Test2 = "Hello world! "Document. write (number (test1) + "<br/>") document. write (number (Test2) + "<br/>") document. write (isnan (test1) + "<br/>") document. write (isnan (Test2) </SCRIPT>

Output:

300
Nan
False
True

Tiy

Nan

How to Use Nan to determine a value