uuid

uuid.js

/**
 len: 长度
 radix：
*/
export default function (len, radix) {
    let CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".split("");
    let chars = CHARS, 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("");
  }