show-hide dropdown menu on hover-mouseout using jquery

show-hide dropdown menu on hover-mouseout using jquery

variant 1
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$(document).ready(function () {

  $("#moretab").mouseenter(function(){
    $("#categories").show(); 
  });

  $("#categories, #moretab").mouseleave(function(){
    $("#categories").hide(); 
  });
});
--------------------------------------------

variant 2
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//html

<ul>
 <li id = "menu"> <a  href ="#"> Settings </a>
   <ul id = "sub_menu">
   <li> <a  href ="#"> page 1</a></li>
   <li> <a  href ="#"> page 2</a></li>
   </ul>
 </li>
 <li>SomeLink</li>
 <li>SomeLink 2</li>
</ul>

//Javascript

        $("#menu").hover(function() {
            $("#sub_menu").show();
        }, function() {
            $("#sub_menu").hide();
        });
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variant 3
------------
$(document).ready(function(){
    $('.dropdown').hover(
    function(){
        $(this).children('.sub-menu').slideDown('fast');
    },
    function () {
        $(this).children('.sub-menu').slideUp('fast');
    });
});