parseFloat Method

Microsoft Office JScript

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Microsoft® JScript® parseFloat Method  Language Reference 
Version 1 

See Also                  Applies To

Description
Returns a floating-point number converted from a string.
Syntax
parseFloat(numstring)

The numstring argument is a string that contains a floating-point number.

Remarks
The parseFloat method returns an numerical value equal to the number contained in numstring. If no prefix of numstring can be successfully parsed into a floating-point number, NaN (not a number) is returned. 
parseFloat("abc")    // Returns NaN.
parseFloat("1.2abc") // Returns 1.2.
You can test for NaN using the isNaN method.

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