JavaScript指定长度和进制的UUID

指定长度和进制的UUID

/**
* 指定长度和进制的UUID
* @param len       长度
* @param radix     进制
* @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('');
}

测试

uuid(32, 2)
"11110011000001100111011111001111"

uuid(32, 8)
"31730315503322654076326054034634"

uuid(32, 10)
"50235847867589708943975575132412"

uuid(32, 16)
"405F8CA9918F71FC9C73DACB47CEC6EE"