golang 数字与时间相乘与redis的问题

HUX布斯

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//Commondurations.ThereisnodefinitionforunitsofDayorlarger

//toavoidconfusionacrossdaylightsavingstimezonetransitions.

//

//TocountthenumberofunitsinaDuration,divide:

//second:=time.Second

//fmt.Print(int64(second/time.Millisecond))//prints1000

//

//ToconvertanintegernumberofunitstoaDuration,multiply:

//seconds:=10

//fmt.Print(time.Duration(seconds)*time.Second)//prints10s

//

const(

NanosecondDuration=1

Microsecond=1000*Nanosecond

Millisecond=1000*Microsecond

Second=1000*Millisecond

Minute=60*Second

Hour=60*Minute

)

看一下重点ToconvertanintegernumberofunitstoaDuration下边的部分.

time.Second*1这个片段中,1并不是int,也不是int64,而是无类型常量,相当于constexp=1和time.Second*a.