34 lines
1.5 KiB
TypeScript
34 lines
1.5 KiB
TypeScript
// https://www.xiabingbao.com/post/crypto/js-crypto-randomuuid-qxcuqj.html
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// 在此表示感謝
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export default function randomUUID() {
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// crypto - 只支持在安全的上下文使用
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if (typeof crypto === 'object') {
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if (typeof crypto.randomUUID === 'function') {
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// https://developer.mozilla.org/en-US/docs/Web/API/Crypto/randomUUID
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return crypto.randomUUID()
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}
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if (typeof crypto.getRandomValues === 'function' && typeof Uint8Array === 'function') {
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// https://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid
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const callback = (c: string) => {
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const num = Number(c)
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return (num ^ (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (num / 4)))).toString(16)
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};
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return '10000000-1000-4000-8000-100000000000'.replace(/[018]/g, callback)
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}
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}
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// 隨機數 - fallback
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let timestamp = new Date().getTime()
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let perforNow = (typeof performance !== 'undefined' && performance.now && performance.now() * 1000) || 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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} |