uuid() {
const len = 32; //32长度
let radix = 16; //16进制
const chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
let uuid = [], i;
radix = radix || chars.length;
if (len) {
for (i = 0; i < len; i++) {
uuid[i] = chars[0 | Math.random() * radix];
}
} else {
let r;
uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
uuid[14] = '4';
for (i = 0; i < 36; i++) {
if (!uuid[i]) {
r = 0 | Math.random() * 16;
uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
}
}
}
return uuid.join('');
},
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