Gets the local ipv4 addresses methods (go language)

func getLocalIPv4Address() (ipv4Address string, err error){
    //获取所有网卡
    addrs, err := net.InterfaceAddrs()

    //遍历
    for _, addr := range addrs {
        //取网络地址的网卡的信息
        ipNet, isIpNet := addr.(*net.IPNet)
        //是网卡并且不是本地环回网卡
        if isIpNet && !ipNet.IP.IsLoopback() {
            ipv4 := ipNet.IP.To4()
            //能正常转成ipv4
            if ipv4 != nil {
                return ipv4.String(), nil
            }
        }
    }

    return
}