JavaScript Reference/Javascript Methods/parseFloat
"parseFloat()" Example
<source lang="javascript">
<html> <body> <button onclick="alert(parseFloat("12.34"));">Number</button> <button onclick="alert(parseFloat("Hello"));">NaN</button> </body> </html>
</source>
"parseFloat()" Syntax, Parameters and Note
<source lang="javascript">
Note: Converts string to a floating-point number. Returns a floating-point number if value supplied is numeric, or NaN if value supplied is not numeric.
Syntax:
parseFloat(param1) Parameters:
param1 Required; the string to be evaluated. </source>