jquery dropdown menu

Question

when i mouse out from a ul li, i want to hide the dropdown ul what i w'll do

Answer 1

This is what I think you meant:

you can use a combination of the hover() event and the toggle() event

$("ul").hover(
    function(){ $("li", this).toggle(); }
);

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But if you literally meant hiding the ul after mouseout of the li then try this:

$("ul li").mouseout(
    function(){ $(this).closest("ul").hide(); }
);