js parseInt('08') does not specify the carry system_javascript skills

Where string is the string to be converted, and radix is ​​binary, octal, hexadecimal or decimal.
When radix is ​​not specified by default, when it is switched with 0x, it is hexadecimal; if it is switched with 0 and the second digit is not x, it is octal (because octal cannot have 8 or 9, so an error is reported Return 0).
So, we should clearly specify the carry system when we use it to prevent errors.
If we usually use decimal digits, we use parseInt("08", 10);