用于在给定位置删除链表节点的 Javascript 程序

给定一个单链表和一个位置，删除给定位置的链表节点。

例子：

Input: position = 1, Linked List = 8->2->3->1->7
Output: Linked List =  8->3->1->7

Input: position = 0, Linked List = 8->2->3->1->7
Output: Linked List = 2->3->1->7

如果要删除的节点是根节点，直接删除即可。要删除中间节点，我们必须有一个指向要删除的节点之前的节点的指针。因此，如果位置不为零，我们运行一个循环位置 1 次并获得指向前一个节点的指针。

下面是上述思想的实现。

Javascript

 
// A complete working javascript program to
// delete a node in a linked list at a
// given position
 
// head of list
var head;
 
/* Linked list Node */
class Node
{
    constructor(val)
    {
        this.data = val;
        this.next = null;
    }
}
 
/* Inserts a new Node at front of the list. */
function push(new_data)
{
     
    /*
     * 1 & 2: Allocate the Node & Put in the data
     */
    var new_node = new Node(new_data);
 
    /* 3. Make next of new Node as head */
    new_node.next = head;
 
    /* 4. Move the head to point to new Node */
    head = new_node;
}
 
/*
 * Given a reference (pointer to pointer) to the
 * head of a list and a position,
 * deletes the node at the given position
 */
function deleteNode(position)
{
     
    // If linked list is empty
    if (head == null)
        return;
     
    // Store head node
    var temp = head;
     
    // If head needs to be removed
    if (position == 0)
    {
         
        // Change head
        head = temp.next;
        return;
    }
     
    // Find previous node of the node to be deleted
    for(i = 0; temp != null && i < position - 1; i++)
        temp = temp.next;
     
    // If position is more than number of nodes
    if (temp == null || temp.next == null)
    return;
     
    // Node temp->next is the node to be deleted
    // Store pointer to the next of node to be deleted
    var next = temp.next.next;
     
    // Unlink the deleted node from list
    temp.next = next;
}
 
/*
* This function prints contents of linked
* list starting from the given node
*/
function printList()
{
    var tnode = head;
    while (tnode != null)
    {
        document.write(tnode.data + " ");
        tnode = tnode.next;
    }
}
 
/*
* Driver program to test above functions.
* Ideally this function should be in a
* separate user class. It is kept here
* to keep code compact
*/
 
/* Start with the empty list */
push(7);
push(1);
push(3);
push(2);
push(8);
 
document.write("Created Linked list is: <br/>");
printList();
 
// Delete node at position 4
deleteNode(4);
 
document.write("<br/>Linked List after " +
               "Deletion at position 4: <br/>");
printList();
 
// This code is contributed by todaysgaurav
 

输出：

Created Linked List: 
 8  2  3  1  7 
Linked List after Deletion at position 4: 
 8  2  3  1 

有关详细信息，请参阅有关在给定位置删除链接列表节点的完整文章！