golang定時器實現

golang定時器，需求是能夠在指定時間後停止。或某種條件出發停止。

package main

import (
"context"
"fmt"
"sync"
"time"
)func main() 
func stoptheworld() 
func goclock() ()
for 	}}
func goclock2() 
}}

123

clock2 current time:  2020-01-07 10:46:19.122178 +0800 cst m=+1.003391336
clock current time:  2020-01-07 10:46:19.122301 +0800 cst m=+1.003513931
clock2 current time:  2020-01-07 10:46:20.121693 +0800 cst m=+2.002832908
clock current time:  2020-01-07 10:46:20.121726 +0800 cst m=+2.002866446
clock2 current time:  2020-01-07 10:46:21.1248 +0800 cst m=+3.005867116
clock current time:  2020-01-07 10:46:21.1248 +0800 cst m=+3.005866846
clock2 current time:  2020-01-07 10:46:22.1235 +0800 cst m=+4.004567391
clock current time:  2020-01-07 10:46:22.123503 +0800 cst m=+4.004569986
clock2 current time:  2020-01-07 10:46:23.119886 +0800 cst m=+5.000879581
clock current time:  2020-01-07 10:46:23.119885 +0800 cst m=+5.000878736
clock2 current time:  2020-01-07 10:46:24.119906 +0800 cst m=+6.000899833
clock current time:  2020-01-07 10:46:24.119945 +0800 cst m=+6.000938638
clock current time:  2020-01-07 10:46:25.121888 +0800 cst m=+7.002808593
clock2 current time:  2020-01-07 10:46:25.121927 +0800 cst m=+7.002847958
clock current time:  2020-01-07 10:46:26.119995 +0800 cst m=+8.000842811
clock2 current time:  2020-01-07 10:46:26.119992 +0800 cst m=+8.000840493
clock2 current time:  2020-01-07 10:46:27.120127 +0800 cst m=+9.000975136
clock current time:  2020-01-07 10:46:27.120108 +0800 cst m=+9.000956121
clock current time:  2020-01-07 10:46:28.122912 +0800 cst m=+10.003686127
done!
clock2 current time:  2020-01-07 10:46:28.122912 +0800 cst m=+10.003686386
done!

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