content doesn't append to div after hover

http://jsfiddle.net/A3uMK/

Hover the links, the content in <dd> doesn't appear in the div, anybody mind 开发者_如何转开发helping?

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That's because the div doesn't appear. You forgot to show the div.

$('div').html($data).show();

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Since you hide the div tag at the beginning, you need to show it later to see its contents.

var $desc = $('div'),
    $dd = $('dl > dd');

$desc.add($dd).hide();

function showDescBox() {
  hideDescBox();
  var $data = $(this).next('dd').html();
  $desc.html($data).show();
}
function hideDescBox() {
  $desc.hide();
}

$('dl > dt').hover(showDescBox, hideDescBox);

http://jsfiddle.net/A3uMK/8/