Js Snowflake(雪花算法)生成随机ID的实现方法
1、snowflake-id插件
importSnowflakeIdfrom"snowflake-id";
constguid=num=>{
constid=newSnowflakeId();
returnid.generate();
};
2、原生使用
varSnowflake=/**@class*/(function(){
functionSnowflake(_workerId,_dataCenterId,_sequence){
this.twepoch=1288834974657n;
//this.twepoch=0n;
this.workerIdBits=5n;
this.dataCenterIdBits=5n;
this.maxWrokerId=-1n^(-1n<this.maxWrokerId||this.workerId<0){
thrownewError('_workerIdmustmaxthan0andsmallthanmaxWrokerId-['+this.maxWrokerId+']');
}
if(this.dataCenterId>this.maxDataCenterId||this.dataCenterId<0){
thrownewError('_dataCenterIdmustmaxthan0andsmallthanmaxDataCenterId-['+this.maxDataCenterId+']');
}
this.workerId=BigInt(_workerId);
this.dataCenterId=BigInt(_dataCenterId);
this.sequence=BigInt(_sequence);
}
Snowflake.prototype.tilNextMillis=function(lastTimestamp){
vartimestamp=this.timeGen();
while(timestamp<=lastTimestamp){
timestamp=this.timeGen();
}
returnBigInt(timestamp);
};
Snowflake.prototype.timeGen=function(){
returnBigInt(Date.now());
};
Snowflake.prototype.nextId=function(){
vartimestamp=this.timeGen();
if(timestamp
控制台输出1141531990672150528n为bigint格式,.toString()转为字符串格式即可
3、ES6使用
importbigIntfrom"big-integer";
constguid=()=>{
constSnowflake=/**@class*/(function(){
functionSnowflake(_workerId,_dataCenterId,_sequence){
//this.twepoch=1288834974657;
this.twepoch=0;
this.workerIdBits=5;
this.dataCenterIdBits=5;
this.maxWrokerId=-1^(-1<this.maxWrokerId||this.workerId<0){
thrownewError(
'config.worker_idmustmaxthan0andsmallthanmaxWrokerId-['+this.maxWrokerId+']'
);
}
if(this.dataCenterId>this.maxDataCenterId||this.dataCenterId<0){
thrownewError(
'config.data_center_idmustmaxthan0andsmallthanmaxDataCenterId-['+
this.maxDataCenterId+
']'
);
}
this.workerId=_workerId;
this.dataCenterId=_dataCenterId;
this.sequence=_sequence;
}
Snowflake.prototype.tilNextMillis=function(lastTimestamp){
vartimestamp=this.timeGen();
while(timestamp<=lastTimestamp){
timestamp=this.timeGen();
}
returntimestamp;
};
Snowflake.prototype.timeGen=function(){
//newDate().getTime()===Date.now()
returnDate.now();
};
Snowflake.prototype.nextId=function(){
vartimestamp=this.timeGen();
if(timestamp
guid()即可调用
4、多次重复调用出现一样id的bug
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
console.log(guid(),newDate().getTime());
修改如下
importSnowflakeIdfrom"snowflake-id";
constguid=num=>{
constsnowflake=newSnowflakeId();
letarr=[];
for(leti=0;i
单个调用guid()
n个调用guid(n)
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