40 lines
1.2 KiB
TypeScript
40 lines
1.2 KiB
TypeScript
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class IdUtils {
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public static genUUID() {
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if (typeof crypto === "object") {
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if (typeof crypto.randomUUID === "function") {
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return crypto.randomUUID();
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}
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if (
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typeof crypto.getRandomValues === "function" &&
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typeof Uint8Array === "function"
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) {
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const callback = c => {
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const num = Number(c);
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return (
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num ^
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(crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (num / 4)))
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).toString(16);
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};
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return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, callback);
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}
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}
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let timestamp = new Date().getTime();
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let perforNow =
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(typeof performance !== "undefined" &&
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performance.now &&
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performance.now() * 1000) ||
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0;
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return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, c => {
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let random = Math.random() * 16;
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if (timestamp > 0) {
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random = (timestamp + random) % 16 | 0;
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timestamp = Math.floor(timestamp / 16);
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} else {
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random = (perforNow + random) % 16 | 0;
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perforNow = Math.floor(perforNow / 16);
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}
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return (c === "x" ? random : (random & 0x3) | 0x8).toString(16);
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});
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}
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}
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