JavaScript parseFloat() function

　JavaScript Global Properties/Function

parseFloat()Function parses parameters and returns a floating-point number.

If encountered with symbol(+or-、number(0-9Characters other than parentheses, decimal points, or exponents, returns the value before the character and ignores the character and all subsequent characters. Allows leading and trailing spaces.

If the value is a string and the first character cannot be converted to a number, parseFloat() returns NaN.

Syntax:

parseFloat(value)

parseFloat("12");　　//　12
parseFloat("12.25");　　　//　12.25
parseFloat("34　45　66");//　34
parseFloat("　　　20　　");//　20
parseFloat('314e-2');　　//　3.14
parseFloat('0.0314E+2');　　　//　3.14
parseFloat('3.14　more non-digit characters');//　3.14

Browser Compatibility

All browsers fully support the parseFloat() function:

Parameter Value

Technical Details

　JavaScript Global Properties/Function