Explanation of the second parameter in JS parsefloat (first argument, second argument)

Today, when I was looking at jquery, I used the parsefloat (the first parameter, 10), I didn't know what the second parameter meant, so I looked it up on the internet, so I forgot to turn it down later.

Definition and Usage: the parsefloat () function resolves a string and returns a floating-point number.

Syntax: parsefloat (String), parameter string is required, representing the string to be parsed

Return value: Returns the parsed number

Precautions:

1. The opening and closing spaces are allowed.

2. If the first character of a string cannot be converted to a number, then parsefloat () returns NaN

3. If you want to parse only the integer part of a number, use the parseint () method.

4. Only the first number in a string is returned.

Attached examples:

<script type= "Text/javascript" >

document.write (parsefloat ("10"))

document.write (parsefloat ("10.00"))

document.write (parsefloat ("10.33"))

document.write (Parsefloat ("34 45 66"))

document.write (parsefloat ("60"))

document.write (parsefloat ("Years"))

document.write (parsefloat ("He was 40"))

</script>

Output in turn:

10

10

10.33

34

60

40

NaN

Here's a second question: What does 10 in parsefloat (the first argument, 10) mean

The second parameter of the parsefloat represents the binary of the conversion, and 10 translates to a 10 binary.