background:url('../images//center.png');
}
.js > div a, .js > div a:before, .js > div a:after {
position:absolute;
}
.js > div a:before {
left:-13px;
content:url('../images//left.png');
}
.js > div a:after {
right:-10px;
top:0;
content:url('../images//right.png');
}
.js > div a:active {
opacity:.65;
}
.js a {
text-decoration:none;
}
.js ul a {
display:block;
color:#000;
padding:.8em 18px;
border-bottom:1px solid #e0e0e0;
background:url('images/next.png') no-repeat 94% 50%;
}
.js ul a:hover {
background-color:#edf3fe;
}
.js a:focus {
outline:none;
}
.js ul {
position:absolute;
top:0;
padding-top:45px;
width:100%;
-webkit-transition:left .4s ease-out;
-moz-transition:left .4s ease-out;
-o-transition:left .4s ease-out;
}
.js ul {
left:0;
}
.js ul ul {
left:320px;
}
有效果图，有代码看起来非常明了，希望大家喜欢。
