process.hrtime()
process.hrtime.bigint()
返回Array包含当前高分辨率实时的元组，在[秒，纳秒]
function getNanoSecTime() {
var hrTime = process.hrtime();
return hrTime[0] * 1000000000 + hrTime[1];
}
node v10.7.0以上
const start = process.hrtime.bigint();
// 191051479007711n
setTimeout(() => {
const end = process.hrtime.bigint();
// 191052633396993n
console.log(`Benchmark took ${end - start} nanoseconds`);
// Benchmark took 1154389282 nanoseconds
}, 1000);
https://nodejs.org/api/process.html#process_process_hrtime_time
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