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Introduction to the use of Math. atan () in JavaScript

Source: Internet
Author: User
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Introduction to the use of Math. atan () in JavaScript

This method returns the arc tangent of radians. The atan method returns a number between-pi/2 and π/2 radian.

Syntax

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Math. atan (x );

The following is the detailed information about the parameters:

  • X: a number

Return Value:

  • Returns the arc tangent of a radian.

Example:

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<Html>

<Head>

<Title> JavaScript Math atan () Method </title>

</Head>

<Body>

<Script type = "text/javascript">

 

Var value = Math. atan (-1 );

Document. write ("First Test Value:" + value );

 

Var value = Math. atan (. 5 );

Document. write ("<br/> Second Test Value:" + value );

 

Var value = Math. atan (30 );

Document. write ("<br/> Third Test Value:" + value );

 

Var value = Math. atan ("string ");

Document. write ("<br/> Fourth Test Value:" + value );

</Script>

</Body>

</Html>

This produces the following results:

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First Test Value:-0.7853981633974483

Second Test Value: 0.4636476090008061

Third Test Value: 1.5374753309166493

Fourth Test Value: NaN

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