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生成 UUID

代码

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/**
 * 生成 UUID
 * @returns {String} UUID
 */
function getUUID() {
    let timestamp = new Date().getTime();
    let perforNow = (typeof performance !== 'undefined' && performance.now && performance.now() * 1000) || 0;
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
        let random = Math.random() * 16;
        if (timestamp > 0) {
            random = (timestamp + random) % 16 | 0;
            timestamp = Math.floor(timestamp / 16);
        } else {
            random = (perforNow + random) % 16 | 0;
            perforNow = Math.floor(perforNow / 16);
        }
        return (c === 'x' ? random : (random & 0x3) | 0x8).toString(16);
    });
};