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Microsoft® JScript™
parseFloat Method
 Language Reference 
Version 1 

See Also                  Applies To

Converts strings into floating point numbers.

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

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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