后来改了，前面的是有错，没考虑周全

Node *Node::searchNode(int nodeIndex)

{

Node *temp=NULL;

if(this->index==nodeIndex)  return this;

if(this->pLChild!=NULL)

{

if(this->pLChild->index==nodeIndex)

return this->pLChild;

else

{

temp=this->pLChild->searchNode(nodeIndex);

if(temp!=NULL) return temp;

}

}

if(this->pRChild!=NULL)

{

if(this->pRChild->index==nodeIndex)

return this->pRChild;

else

{

temp=this->pRChild->searchNode(nodeIndex);

if(temp!=NULL) return temp;

}

}

return NULL;

}