JS下拉缓冲菜单示例代码

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我是靠谱客的博主畅快鸵鸟，最近开发中收集的这篇文章主要介绍JS下拉缓冲菜单示例代码，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

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> 