JavaScript parseInt () function

Definition and Usage

parseInt () function to parse a string and returns an integer.

When the parameter radix is ​​0 or not set parameter, parseInt () based on the string to determine the number base.

When the parameter is ignored radix, JavaScript default base figure as follows:

• If the string beginning with "0x", parseInt () will resolve the rest of the string of hexadecimal integer.
• If the string 0 at the beginning, then the ECMAScript v3 allows parseInt () is an implementation of the subsequent character parsed as octal or hexadecimal numbers.
• If the string begins with a number from 1 to 9 to, parseInt () will resolve it to decimal integer.

grammar

Browser Support

All major browsers support parseInt () function

Tips and Notes

Note: Only the first number in the string is returned.

Note: Leading and trailing spaces are allowed.

Note: If the first character can not be converted to digital, then parseFloat () returns NaN.

Note: The string "0" at the beginning of the old browser's default octal base. ECMAScript 5, the default decimal base.

Examples

Note: old browsers due to the use of the old version of the ECMAScript (ECMAScript version less than ECMAScript 5, the default when a string of "0" at the beginning octal, ECMAScript 5 using a decimal), so parsing ( "010") will output 8 .