parseFloat(string)
parseFloat
takes a string and return a float value.
Ex:
var a =
parseFloat("123.45"); // Return 123.45
var b =
parseFloat("0.987654"); // Return 0.987654
parseFloat
converts the character by character, if it is unable to convert any character
it ignores it and all succeeding characters and returns the float value parsed
up to that point.
var c =
parseFloat("123.45awq34"); // Return 123.45
If the
first character cannot be converted to a number, parseFloat returns NaN.
var d =
parseFloat("a1234"); // Return NaN
parseFloat.html
<!DOCTYPE html> <html> <head> <title>parseFloat</title> </head> <body> <script type="text/javascript"> var a = parseFloat("123.45"); // Return 123.45 var b = parseFloat("0.987654"); // Return 0.987654 var c = parseFloat("123.45awq34"); // Return 123.45 var d = parseFloat("a1234"); // Return NaN document.write("a = " + a + "<br />"); document.write("b = " + b + "<br />"); document.write("c = " + c + "<br />"); document.write("d = " + d + "<br />"); </script> </body> </html>
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