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