至于我，這是對第三個if語句的誤解。為什么list.tail.next = newNode也向head.next添加元素？func (list *SingleLinkedList) Add(v int) {    newNode := &SLLNode{value: v}    if list.head == nil {        list.head = newNode    } else if list.tail == list.head {        list.head.next = newNode    } else if list.tail != nil {        list.tail.next = newNode    }    list.tail = newNode}這是一個編譯的程序示例：package mainimport "fmt"// Linked List Codetype SingleLinkedList struct {    head *SLLNode    tail *SLLNode}func NewSingleLinkedList() *SingleLinkedList {    return new(SingleLinkedList)}func (list *SingleLinkedList) Add(v int) {    newNode := &SLLNode{value: v}    if list.head == nil {        list.head = newNode    } else if list.tail == list.head {        list.head.next = newNode    } else if list.tail != nil {        list.tail.next = newNode    }    list.tail = newNode}func (list *SingleLinkedList) String() string {    stringResult := ""    for n := list.head; n != nil; n = n.next {        stringResult += fmt.Sprintf(" {%d} ", n.GetValue())    }    return stringResult}// Node Codetype SLLNode struct {    next  *SLLNode    value int}func (sNode *SLLNode) SetValue(v int) {    sNode.value = v}func (sNode *SLLNode) GetValue() int {    return sNode.value}func main() {    // Linked List    list:= NewSingleLinkedList()    list.Add(4)    list.Add(6)    list.Add(3)    list.Add(3)    fmt.Println(list)}