在项目中使用time包时，睡眠时间时想要通过配置文件获取，然而整数与时间相乘又报错。如下

查询time包发现

// A Duration represents the elapsed time between two instants
// as an int64 nanosecond count. The representation limits the
// largest representable duration to approximately 290 years.
type Duration int64

即，其实就是一个int64的数。最后先把需要的数字进行转换，这样解决即可

err = client.Set(ctx, key, data, time.Duration(ex)*time.Second).Err()