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下拉缓冲菜单效果想必大家都有见过吧，在本文使用JS轻松实现下，想学习的朋友可以参考下
复制代码 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style>
body,html,div,ul,li,span,img,a{
margin:0;
padding:0;
}
a{
text-decoration:none;
color:#000;
font-weight:bold;
width:150px;
display:inline-block;
text-align:center;
}
li{
list-style:none;
}
img{
width:0;
height:0;
outline:none;
}
#tab{
margin:200px 0 0 300px;
}
#tab li{
float:left;
width:150px;
height:50px;
line-height:50px;
position:relative;
margin-right:30px;
}
#tab img.map,#tab span.content{
position:absolute;
}
#tab span.content{
background:#333;
color:#FFF;
font-size:14px;
text-align:center;
height:0;
}
#tab img.map{
left:50%;
bottom:0;
}
</style>
<title>JS下拉缓冲菜单_网页代码站()</title>
</head>
<body>
<div id="tab">
<ul>
<li style="background:url('/images/20130826/psb1.png')">
<a href="#">路飞</a>
<img src="/jscss/demoimg/201210/psb1.jpg" class="map" />
<span class="content">草帽海贼团船长，特征是头戴草帽，天性乐观、热情、善良、天真、单纯。</span>
</li>
<li style="background:url('/images/20130826/psb1.png')">
<a href="#">索隆</a>
<img src="/images/20130826/psb2.jpg" class="map" />
<span class="content">草帽海贼团剑士，绿色头发，左耳戴三只黄色露珠耳环，绿色的肚兜,路痴。</span>
</li>
<li style="background:url('/images/20130826/psb1.png')">
<a href="#">娜美</a>
<img src="/jscss/demoimg/201210/psb3.jpg" class="map" />
<span class="content">精通气象学和航海术，擅长偷术、骗术、谈判及威胁恐吓，头脑聪明又机灵。</span>
</li>
<li style="background:url('/images/20130826/psb1.png')">
<a href="#">山治</a>
<img src="/images/20130826/psb4.jpg" class="map" />
<span class="content">草帽海贼团厨师，金发，有着卷曲眉毛，永远遮住半边脸的家伙，海贼中的绅士。</span>
</li>
</ul>
</div>
<script type="text/javascript">
function kzxf_zoom(id)
{
this.initialize.apply(this, arguments)
}
kzxf_zoom.prototype =
{
initialize : function()
{
var _this = this;
this.wrapBox = document.getElementById('tab');
this.oLi = this.wrapBox.getElementsByTagName('li');
this.aImg = this.wrapBox.getElementsByTagName('img');
this.content = this.wrapBox.getElementsByTagName('span');
for(var i=0;i<this.oLi.length;i++)
{
(function(i){
_this.oLi[i].onmouseover = function()
{
_this.jump(_this.aImg[i], _this.content[i]);
};
_this.oLi[i].onmouseout = function()
{
_this.hidden(_this.aImg[i], _this.content[i]);
};
})(i)
}
},
jump : function(obj1, obj2)
{
var _this = this;
_this.animation(obj1, {height:130, width:160, marginLeft:-78, marginTop:-128},function(){
_this.animation(obj1, {height:115, width:140, marginLeft:-70, marginTop:-115}, function(){
_this.animation(obj1, {height:120, width:150, marginLeft:-75, marginTop:-120})
})
});
_this.animation(obj2, {height:200});
},
hidden : function(obj1, obj2)
{
var _this = this;
_this.animation(obj1, {width:0, height:0, marginLeft:0, marginTop:0});
_this.animation(obj2, {height:0});
},
animation : function(obj, oAttr, fnCallBack)
{
var _this = this;
clearInterval(obj.timer);
obj.timer = setInterval(function()
{
var bStop = true;
for(proper in oAttr)
{
var iCur = parseFloat(_this.css(obj, proper));
proper == 'opacity' && (iCur = parseInt(iCur.toFixed(2) * 100));
var iSpeed = (oAttr[proper] - iCur) / 5;
iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
if(iCur != oAttr[proper])
{
bStop = false;
_this.css(obj, proper, iCur + iSpeed);
}
}
if(bStop)
{
clearInterval(obj.timer);
fnCallBack && fnCallBack.apply(_this, arguments);
}
},20);
},
css : function(obj, attr, value)
{
if(arguments.length == 2)
{
return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj, null)[attr]
}
if(arguments.length == 3)
{
switch(attr)
{
case 'width' :
case 'height' :
case 'top' :
case 'bottom' :
case 'left' :
case 'marginLeft':
case 'marginTop':
obj.style[attr] = value + 'px';
break;
case 'opacity' :
obj.style.filter = 'alpha(opacity = '+value+' )';
obj.style.opacity = value / 100;
break;
default :
obj.style[attr] = value;
break;
}
}
}
};
window.onload = function()
{
new kzxf_zoom('tab')
};
</script>
<br />
http://user.qzone.qq.com/1198772766
</body>
</html>
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发表于 2013-8-30 16:34:32
