内置方法可以直接调用。
- parseInt
/**
- Converts A string to an integer.
- @param s A string to convert into a number.
- @param radix A value between 2 and 36 that specifies the base of the number in numString.
- If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
- All other strings are considered decimal.
*/
declare function parseInt(s: string, radix?: number): number;
把字符串按照对应的进制转化为数字。得到的数字是10进制，radix是说字符串的进制。
var s = '110';
console.log(parseInt(s, 2));
console.log(parseInt(s, 10));
console.log(parseInt(s, 4));
6
110
20
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