在循环内追加会重复 Golang 中的最后一个值

Question

当尝试在 go 中追加迭代的值时，该函数将最后一次迭代追加 4 次。例如，我正在尝试将包含网卡数据的字符串解析为地图，并且在迭代时仅附加最后一个：这是带有代码的游乐场链接： https ://go.dev/play/p/mKtFvK36PMnpackage mainimport (    "fmt"    "strings")type Foo struct {    val int}func main() {    NetworkJson := "4 NIC(s) Installed.,[01]: Realtek PCIe GbE Family Controller,      Connection Name: Ethernet,      DHCP Enabled:    Yes,      DHCP Server:     10.101.10.13,      IP address(es),      [01]: 10.1.2.62,[02]: VirtualBox Host-Only Ethernet Adapter,      Connection Name: VirtualBox Host-Only Network,      DHCP Enabled:    No,      IP address(es),      [01]: 192.168.56.1,      [02]: fe80::4c17:978a:2c91:8e27,[03]: VMware Virtual Ethernet Adapter for VMnet1,      Connection Name: VMware Network Adapter VMnet1,      DHCP Enabled:    Yes,      DHCP Server:     192.168.146.254,      IP address(es),      [01]: 192.168.146.1,      [02]: fe80::88b4:d443:2ab8:59b5,[04]: VMware Virtual Ethernet Adapter for VMnet8,      Connection Name: VMware Network Adapter VMnet8,      DHCP Enabled:    Yes,      DHCP Server:     192.168.128.254,      IP address(es),      [01]: 192.168.128.1,      [02]: fe80::a40d:e64:fa9f:e82f"    var IPs []string    var Data []string    var IPMap = make(map[string]string)    var CardMap = make(map[string]interface{})    var CardIP = make(map[string][]map[string]string)    var NetCard = make(map[string][]interface{})    // Faz loop entre as placas de rede    for _, Cards := range strings.Split(string(NetworkJson), ",[") {        // Faz loop entre os dados de cada placa        for _, CardData := range strings.Split(string(Cards), ",") {            // Verifica se dado inicia com espaço em branco            if strings.HasPrefix(CardData, " ") {                // Verifica se dado sem o espaço em branco começa com [                if strings.HasPrefix(strings.TrimSpace(CardData), "[") {                }            }        }

Answer 1

您将所有内容都存储到同一个地图变量 CardMap 中，并且您使用的是单数键“Card Name”。append(NetCard["Cards"], CardMap)不执行 CardMap 的深拷贝，仅附加浅拷贝，因此每次迭代都会更新浅拷贝的数据。你的其他变量有同样的问题。

将变量声明移动到主循环中：

var NetCard = make(map[string][]interface{})

// Faz loop entre as placas de rede

for _, Cards := range strings.Split(string(NetworkJson), ",[") {

    var IPs []string

    var Data []string

    var IPMap = make(map[string]string)

    var CardMap = make(map[string]interface{})

    var CardIP = make(map[string][]map[string]string)

    // Faz loop entre os dados de cada placa

    for _, CardData := range strings.Split(string(Cards), ",") {

        // ...

https://go.dev/play/p/VE_VWOsvsna