删除链表中的节点

let obj = {
  ket: "a",
  next: {
    key: "b",
    next: {
      key: "c",
      next: {
        key: "d",
        next: null,
      },
    },
  },
};

var deleteNode = function (node) {
  node.val = node.next.val;
  node.next = node.next.next;
};