golang的time包
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纳秒级别时间:
const ( Nanosecond Duration = 1 Microsecond = 1000 * Nanosecond Millisecond = 1000 * Microsecond Second = 1000 * Millisecond Minute = 60 * Second Hour = 60 * Minute )
Nanosecond 纳秒:1
Microsecond 微妙:1微妙=1000纳秒
Millisecond 毫秒:1毫秒=1000微妙
Second 秒:1秒=1000毫秒
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