jQuery -> 获取兄弟元?

<div>
    <h1>Main title</h1>
    <h2>Section title</h2>
    <p>Some content...</p>
    <h2>Section title</h2>
    <p>More content...</p>
</div>

$('h1 + h2') 
  // Select ALL h2 elements that are adjacent siblings of H1 elements.

$('h1').siblings('h2,h3,p');
  // Select all H2, H3, and P elements that are siblings of H1 elements.

<ul>
    <li>First item</li>
    <li class="selected">Second Item</li>
    <li>Third item</li>
    <li>Fourth item</li>
    <li>Fifth item</li>
</ul>

$('li.selected').nextAll('li');

$('li.selected ~ li');

var topHeaders = $('h1');
topHeaders.next('h2').css('margin', '0);