核心算法版权属于 yitter
项目更多介绍参照:https://github.com/yitter/idgenerator
代码贡献者:zhupengfei(在 bubao 布宝 的JS基础上改版,感谢bubao 布宝)
js Number 类型最大数值:9007199254740992(16位),
在JS中没有bigint类型,所以建议将ID控制在16位以内,统一使用number类型
时间基准为2020年1月1日,seqBitLength=11以下输出为number类型,超过11输出为bigint类型
npm i simple-flakeid
根据输出数值判断,小于number最大值时输出number类型,大于时输出bigint
始终输出number类型,超过时throw error
始终输出bigint类型
ts-node test/test1.ts
const snowId = require('simple-flakeid')
let gen1 = new snowId.SnowflakeIdv1({ workerId: 1 })
for (let i = 0; i < 10; i++) {
let id1 = gen1.NextId()
console.log(`${i} ID:${id1} ${typeof id1} length:${id1.toString().length}`)
}
output:
$ node js/demo1.js
0 ID:235100305752133 number length:15
1 ID:235100305772613 number length:15
2 ID:235100305776709 number length:15
3 ID:235100305776710 number length:15
4 ID:235100305776711 number length:15
5 ID:235100305776712 number length:15
6 ID:235100305776713 number length:15
7 ID:235100305780805 number length:15
8 ID:235100305780806 number length:15
9 ID:235100305780807 number length:15
const snowId = require('simple-flakeid')
let gen1 = new snowId.SnowflakeIdv1({ workerId: 1 })
for (let i = 0; i < 10; i++) {
let id1 = gen1.NextBigId()
console.log(`${i} ID:${id1} ${typeof id1} length:${id1.toString().length}`)
}
output:
$ node js/demo2.js
0 ID:235104756604997 bigint length:15
1 ID:235104756629573 bigint length:15
2 ID:235104756629574 bigint length:15
3 ID:235104756629575 bigint length:15
4 ID:235104756629576 bigint length:15
5 ID:235104756629577 bigint length:15
6 ID:235104756633669 bigint length:15
7 ID:235104756633670 bigint length:15
8 ID:235104756633671 bigint length:15
9 ID:235104756633672 bigint length:15
import { SnowflakeIdv1 } from "../index"
let gen1 = new SnowflakeIdv1({ workerId: 1 })
for (let i = 0; i < 10; i++) {
let id1 = gen1.NextId()
console.log(`${i} ID:${id1} ${typeof id1} length:${id1.toString().length}`)
}
output:
$ ts-node ts/demo1.ts
0 ID:235099434217541 number length:15
1 ID:235099434225733 number length:15
2 ID:235099434225734 number length:15
3 ID:235099434225735 number length:15
4 ID:235099434225736 number length:15
5 ID:235099434229829 number length:15
6 ID:235099434229830 number length:15
7 ID:235099434229831 number length:15
8 ID:235099434229832 number length:15
9 ID:235099434233925 number length:15
更多示例代码:https://github.com/zhupengfeivip/simple-flakeId-demo.git 包含在API中如何处理bigint的长度问题,请看示例代码
在mysql中int类型最大长度是10位数字,由于本算法默认生成的是15位,最短也是11位,所以在mysql中需要使用bigint数据类型
new Date('Wed, 01 Jan 2020 00:00:00 GMT').getTime()
1577836800000
new Date('Wed, 01 Jan 2021 00:00:00 GMT').getTime()
1609459200000