碰到一个Golang time.Sleep()的问题，这golang的time.sleep的功能貌似要比python ruby都要精细些，python的等待只是time.sleep()而已，而golang可以time.Sleep(10 * time.Second) 毫秒、秒分时等不同日期来搞… 大事不干，净整些没用的…
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重现一下问题，用math/rannd得到10以内的随机数，然后time.sleep()等待…
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num := rand.Int31n(10) time.sleep(num * time.Second) |
会遇到下面的问题:
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#xiaorui.cc # command-line-arguments ./lock.go:88: invalid operation: int(DefaultTimeout) * time.Second (mismatched types int and time.Duration) |
解决的方法:
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time.Sleep(time.Duration(num) * time.Second) |
期初原因以为是rand随机数有问题，简单看了rand的函数说明感觉没问题！ 下面是产生的原因:
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func Sleep(d Duration) Sleep pauses the current goroutine for at least the duration d. A negative or zero duration causes Sleep to return immediately. |
int32 and time.Duration are different types. You need to convert the int32 to a time.Duration, such as time.Sleep(time.Duration(rand.Int31n(1000)) * time.Millisecond).
下面是个完整的golang随机数，然后time.sleep()的例子:
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package main import ( "fmt" "math/rand" "time" ) func main() { rand.Seed(time.Now().UnixNano()) for i := 0; i < 10; i++ { x := rand.Intn(10) fmt.Println(x) time.Sleep(time.Duration(x) * time.Second) } } |
Golang的time.sleep虽然可以直接用数字，但不能是float浮点型.
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time.Sleep(1 * time.Second) //可以 time.Sleep(1.1 * time.Second) //BUG time.Sleep(time.Duration(yourTime) * time.Second) //可以 |
提示的错误是, constant 1.1 truncated to integer 。至于原因到这里看 https://golang.org/pkg/time/#Duration
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