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JS下拉緩沖菜單示例代碼

更新時(shí)間：2013年08月30日 16:34:32 作者：

下拉緩沖菜單效果想必大家都有見(jiàn)過(guò)吧，在本文使用JS輕松實(shí)現(xiàn)下，想學(xué)習(xí)的朋友可以參考下

 
<!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; 
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a{ 
text-decoration:none; 
color:#000; 
font-weight:bold; 
width:150px; 
display:inline-block; 
text-align:center; 
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li{ 
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} 
img{ 
width:0; 
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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; 
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#tab span.content{ 
background:#333; 
color:#FFF; 
font-size:14px; 
text-align:center; 
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#tab img.map{ 
left:50%; 
bottom:0; 
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</style> 
<title>JS下拉緩沖菜單_網(wǎng)頁(yè)代碼站()</title> 
</head> 

<body> 
<div id="tab"> 
<ul> 
<li style="background:url('/images/20130826/psb1.png')"> 
<a href="#">路飛</a> 
<img src="/jscss/demoimg/201210/psb1.jpg" class="map" /> 
<span class="content">草帽海賊團(tuán)船長(zhǎng)，特征是頭戴草帽，天性樂(lè)觀、熱情、善良、天真、單純。</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">草帽海賊團(tuán)劍士，綠色頭發(fā)，左耳戴三只黃色露珠耳環(huán)，綠色的肚兜,路癡。</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">精通氣象學(xué)和航海術(shù)，擅長(zhǎng)偷術(shù)、騙術(shù)、談判及威脅恐嚇，頭腦聰明又機(jī)靈。</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">草帽海賊團(tuán)廚師，金發(fā)，有著卷曲眉毛，永遠(yuǎn)遮住半邊臉的家伙，海賊中的紳士。</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> 