JavaScript指定長度和進制的UUID

指定長度和進制的UUID

/**
 * 指定長度和進制的UUID
 * @param len       長度
 * @param radix     進制
 * @returns {string}
 */
function uuid(len, radix) {
    var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
    var uuid = [], i;
    radix = radix || chars.length;
    if (len) {
        for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix];
    } else {
        var r;
        uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
        uuid[14] = '4';
        for (i = 0; i < 36; i++) {
            if (!uuid[i]) {
                r = 0 | Math.random()*16;
                uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
            }
        }
    }
    return uuid.join('');
}

測試

uuid(32, 2)
"11110011000001100111011111001111"

uuid(32, 8)
"31730315503322654076326054034634"

uuid(32, 10)
"50235847867589708943975575132412"

uuid(32, 16)
"405F8CA9918F71FC9C73DACB47CEC6EE"