javascript雪花算法生成id

以下是两种JavaScript实现雪花算法生成ID的方法：

1. 使用snowflake-id插件

import SnowflakeId from "snowflake-id";
const id = new SnowflakeId();
const guid = num => {
  return id.generate();
};

2. 原生实现

var Snowflake = /** @class */ (function() {
  function Snowflake(workerId, datacenterId, sequence) {
    this.workerId = workerId || 0;
    this.datacenterId = datacenterId || 0;
    this.sequence = sequence || 0;
    this.lastTimestamp = -1;
  }
  Snowflake.prototype.nextId = function() {
    var timestamp = this.timeGen();
    if (timestamp < this.lastTimestamp) {
      throw new Error(
        "Snowflake clock moved backwards. Refusing to generate id for " +
          (this.lastTimestamp - timestamp) +
          " milliseconds"
      );
    }
    if (this.lastTimestamp == timestamp) {
      this.sequence = (this.sequence + 1) & Snowflake.SEQUENCE_MASK;
      if (this.sequence == 0) {
        timestamp = this.tilNextMillis(this.lastTimestamp);
      }
    } else {
      this.sequence = 0;
    }
    this.lastTimestamp = timestamp;
    var id =
      ((timestamp - Snowflake.TWEPOCH) << Snowflake.TIMESTAMP_LEFT_SHIFT) |
      (this.datacenterId << Snowflake.DATA_CENTER_ID_SHIFT) |
      (this.workerId << Snowflake.WORKER_ID_SHIFT) |
      this.sequence;
    return id.toString();
  };
  Snowflake.prototype.tilNextMillis = function(lastTimestamp) {
    var timestamp = this.timeGen();
    while (timestamp <= lastTimestamp) {
      timestamp = this.timeGen();
    }
    return timestamp;
  };
  Snowflake.prototype.timeGen = function() {
    return new Date().getTime();
  };
  Snowflake.TWEPOCH = 1288834974657;
  Snowflake.WORKER_ID_BITS = 5;
  Snowflake.DATA_CENTER_ID_BITS = 5;
  Snowflake.MAX_WORKER_ID = -1 ^ (-1 << Snowflake.WORKER_ID_BITS);
  Snowflake.MAX_DATA_CENTER_ID = -1 ^ (-1 << Snowflake.DATA_CENTER_ID_BITS);
  Snowflake.SEQUENCE_BITS = 12;
  Snowflake.WORKER_ID_SHIFT = Snowflake.SEQUENCE_BITS;
  Snowflake.DATA_CENTER_ID_SHIFT = Snowflake.SEQUENCE_BITS + Snowflake.WORKER_ID_BITS;
  Snowflake.TIMESTAMP_LEFT_SHIFT =
    Snowflake.SEQUENCE_BITS + Snowflake.WORKER_ID_BITS + Snowflake.DATA_CENTER_ID_BITS;
  Snowflake.SEQUENCE_MASK = -1 ^ (-1 << Snowflake.SEQUENCE_BITS);
  return Snowflake;
})();
var snowflake = new Snowflake(1, 1, 1);
var id = snowflake.nextId();