version compare toolkit

versionCompare.js

/**
 * 版本对比
 *
 * @param {string} a 对比版本号
 * @param {string} b 参考版本号
 * @return {number}  `1`(`a > b`) || `-1`(`a < b`) || `0`(`a = b`)
 */
function versionCompare(a, b) {
    a = a.split('.');
    b = b.split('.');

    for (var i = 0, n = Math.max(a.length, b.length); i < n; i++) {
        a[i] = parseInt(a[i], 10) || 0;
        b[i] = parseInt(b[i], 10) || 0;

        if (a[i] === b[i]) {
            continue;
        }

        return a[i] > b[i] ? 1 : -1;
    }

    return 0;
}