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33 lines
987 B
33 lines
987 B
3 years ago
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/**
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* @description: 生成一个uid，全局唯一标识符
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* @param {Number} len uid的长度
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* @param {Number} radix 进制数
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* @return {String}
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* @example getUid(12) // 18djrujZHyaO
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*/
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export default function getUid(len = 12, radix = 0) {
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const chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
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const uuid = [];
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let i;
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radix = radix > 0 ? radix : chars.length;
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if (len) {
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// Compact form
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for (i = 0; i < len; i++) uuid[i] = chars[0 | (Math.random() * radix)];
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} else {
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// rfc4122, version 4 form
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let r;
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// rfc4122 requires these characters
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uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
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uuid[14] = '4';
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// Fill in random data. At i==19 set the high bits of clock sequence as
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// per rfc4122, sec. 4.1.5
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for (i = 0; i < 36; i++) {
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if (!uuid[i]) {
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r = 0 | (Math.random() * 16);
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uuid[i] = chars[i == 19 ? (r & 0x3) | 0x8 : r];
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}
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}
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}
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return uuid.join('');
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}
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