golang round to float bit
///golang保留两位小数
func RoundFloat(val float64, precision int) float64 {
ratio := math.Pow(10, float64(precision))
return math.Round(val*ratio) / ratio
}
func main() {
fmt.Println(RoundFloat(3.1415926, 2))
fmt.Println(RoundFloat(3.1415926, 1))
}