UUID是一個(gè)由4個(gè)連字號(hào)(-)將32個(gè)字節(jié)長(zhǎng)的字符串分隔后生成的字符串，總共36個(gè)字節(jié)長(zhǎng)拍鲤。比如：29be34ed-1860-47e8-9a52-7707578a2b98
function randomUUID() {
const hexDigits = "0123456789abcdef";
const s = [];
for (let i = 0; i < 36; i++) {
s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
}
s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010
s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
s[8] = s[13] = s[18] = s[23] = "-";
const uuid = s.join("");
return uuid;
}
