How to display submenu in jQuery?

Actually, my sub-menu is on display : none. I need to display the class sub-menu in jQuery. How can do that ?

<li class="menu-item" id="menu-item-2292">
<a href="/photos">Photos</a><br/>
<ul class="sub-men开发者_StackOverflow中文版u"><br/><li class="menu-item" id="menu-item-2296">Portrait</li>
</ul>
</li>

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$('.menu-item').hover(
  function () {
    $('.sub-menu').show();
  },
  function () {
    $('.sub-menu').hide();
  }
);

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(".sub-menu").Show() - to show menu

(".sub-menu").Hide() - to hide menu