基于CSS3和jQuery实现跟随鼠标方位的Hover特效

<ul id="da-thumbs" class="da-thumbs">
<li>
<a href="http://dribbble.com/shots/502538-Natalie-Justin-Cleaning">
<img src="images/7.jpg" />
<div><span>Natalie & Justin Cleaning by Justin Younger</span></div>
</a>
</li>
<li>
<!-- ... -->
</li>
<!-- ... -->
</ul>

.da-thumbs li {
float: left;
margin: 5px;
background: #fff;
padding: 8px;
position: relative;
box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.da-thumbs li a,
.da-thumbs li a img {
display: block;
position: relative;
}
.da-thumbs li a {
overflow: hidden;
}
.da-thumbs li a div {
position: absolute;
background: rgba(75,75,75,0.7);
width: 100%;
height: 100%;
}

this.$el.on( 'mouseenter.hoverdir, mouseleave.hoverdir', function( event ) {
var $el = $( this ),
$hoverElem = $el.find( 'div' ),
direction = self._getDir( $el, { x : event.pageX, y : event.pageY } ),
styleCSS = self._getStyle( direction );
if( event.type === 'mouseenter' ) {
$hoverElem.hide().css( styleCSS.from );
clearTimeout( self.tmhover );
self.tmhover = setTimeout( function() {
$hoverElem.show( 0, function() {
var $el = $( this );
if( self.support ) {
$el.css( 'transition', self.transitionProp );
}
self._applyAnimation( $el, styleCSS.to, self.options.speed );
} );
}, self.options.hoverDelay );
}
else {
if( self.support ) {
$hoverElem.css( 'transition', self.transitionProp );
}
clearTimeout( self.tmhover );
self._applyAnimation( $hoverElem, styleCSS.from, self.options.speed );
}
} );