string转成uint64:
argUint64, _ := strconv.ParseUint(*arg, 10, 64)

string转成int: 
int, err := strconv.Atoi(string)


string转成int64: 
int64, err := strconv.ParseInt(string, 10, 64)


int转成string: 
string := strconv.Itoa(int)


int64转成string: 
string := strconv.FormatInt(int64,10)

Float64转string

strconv.FormatFloat(f float64, fmt byte, prec, bitSize int) string

#int64转为字符串
string=strconv.FormatInt(time.Now().Unix(),10 )