ParseInt converts the numbers at the beginning of the string to int. If the start is not a number, NaN parseInt is returned to convert the numbers at the beginning of the string to int. If the start is not a number, NaN is returned.
Definition and usage
The parseInt (string, radix) function parses a string and returns an integer.
This function has two parameters. The first parameter is the string to be parsed. this parameter is required. The second parameter indicates the base number of The number to be parsed, if this parameter is omitted or its value is 0, the number is parsed based on 10. If it starts with "0x" or "0X", it will base on 16.
If this parameter is smaller than 2 or greater than 36, parseInt () returns NaN.
Tips and comments
Note: Only the first digit in the string is returned.
Note: spaces at the beginning and end are allowed.
Tip: if the first character of a string cannot be converted to a number, parseFloat () returns NaN.
Instance:
