ut2/es/toNumber.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

import isObject from './isObject.js';
import isSymbol from './isSymbol.js';

var reIsBinary = /^0b[01]+$/i;
var reIsOctal = /^0o[0-7]+$/i;
var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
function toNumber(value) {
    if (typeof value === 'number') {
        return value;
    }
    if (isSymbol(value)) {
        return NaN;
    }
    if (isObject(value)) {
        value = Number(value);
    }
    if (typeof value !== 'string') {
        return value === 0 ? value : +value;
    }
    value = value.trim();
    var isBinary = reIsBinary.test(value);
    return isBinary || reIsOctal.test(value) ? parseInt(value.slice(2), isBinary ? 2 : 8) : reIsBadHex.test(value) ? NaN : +value;
}

export { toNumber as default };