recoder-code
Version:
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15 lines (12 loc) • 350 B
JavaScript
var IDX=256, HEX=[], SIZE=256, BUFFER;
while (IDX--) HEX[IDX] = (IDX + 256).toString(16).substring(1);
function uid(len) {
var i=0, tmp=(len || 11);
if (!BUFFER || ((IDX + tmp) > SIZE*2)) {
for (BUFFER='',IDX=0; i < SIZE; i++) {
BUFFER += HEX[Math.random() * 256 | 0];
}
}
return BUFFER.substring(IDX, IDX++ + tmp);
}
exports.uid = uid;