//实现导航伸缩功能
function menuChange1(obj, menu1,menu2) {
    var menuObj1 = document.getElementById(menu1);
     var menuObj2 = document.getElementById(menu2);
   
  menuObj1.style.display = "";
             menuObj2.style.display = "none";
           
  
}
//实现导航伸缩功能
function menuChange2(obj, menu1,menu2) {
    var menuObj1 = document.getElementById(menu1);
     var menuObj2 = document.getElementById(menu2);
   

          
              menuObj1.style.display = "none";
             menuObj2.style.display = "";
  
}
function hideMenu(menu) {
    menu.style.display = "none";

}