string转成int:

int, err := strconv.Atoi(string)

string转成int64:

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

string转成uint64:

uint64, err := strconv.ParseUint(string, 10, 64)

int转成string:

string := strconv.Itoa(int)

int64转成string:

string := strconv.FormatInt(int64,10)

uint64转成string:

string := strconv.FormatUint(uint64,10)