void Menu()
{//功能菜单
cout<<"\n\n\t\t 请选择以下功能:"<<endl;
cout<<"\n\t\t 1.输出信息表"<<endl;
cout<<"\t\t 2.输入数据元素"<<endl;
cout<<"\t\t 3.删除数据元素"<<endl;
cout<<"\t\t 4.查找数据元素"<<endl;
cout<<"\t\t 5.清空链表"<<endl;
cout<<"\t\t 0.退出"<<endl;
cout<<"\t\t ==================================="<<endl;
}