本文实例讲述了JS+CSS实现的圆角下拉菜单效果代码。分享给大家供大家参考，具体如下：
相信不少朋友会喜欢这一款菜单，CSS+JS实现的圆角下拉菜单，没有使用任何修饰性的图片哦，圆角完全是用JS完成的，因此代码多了些，想使用的朋友把JS文件提取出来另存，这样更合理些。
运行效果截图如下：
在线演示地址如下：
http://demo.maopiaopiao.com/js/2015/js-css-jd-cicle-style-button-demo/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head>
<title>QuickMenu 超强悍菜单</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<style type="text/css">
.qmmc .qmdivider{display:block;font-size:1px;border-width:0px;border-style:solid;position:relative;z-index:1;}.qmmc .qmdividery{float:left;width:0px;}.qmmc .qmtitle{display:block;cursor:default;white-space:nowrap;position:relative;z-index:1;}.qmclear {font-size:1px;height:0px;width:0px;clear:left;line-height:0px;display:block;float:none !important;}.qmmc {position:relative;zoom:1;z-index:10;}.qmmc a, .qmmc li {float:left;display:block;white-space:nowrap;position:relative;z-index:1;}.qmmc div a, .qmmc ul a, .qmmc ul li {float:none;}.qmsh div a {float:left;}.qmmc div{visibility:hidden;position:absolute;}.qmmc .qmcbox{cursor:default;display:block;position:relative;z-index:1;}.qmmc .qmcbox a{display:inline;}.qmmc .qmcbox div{float:none;position:static;visibility:inherit;left:auto;}.qmmc li {z-index:auto;}.qmmc ul {left:-10000px;position:absolute;z-index:10;}.qmmc, .qmmc ul {list-style:none;padding:0px;margin:0px;}.qmmc li a {float:none;}.qmmc li:hover>ul{left:auto;}#qm0 ul {top:100%;}#qm0 ul li:hover>ul{top:0px;left:100%;}
#qm0
{
padding:5px;
border-width:1px;
border-style:solid;
border-color:#eeeeee;
}
#qm0 a
{
padding:5px 4px 5px 5px;
color:#555555;
font-family:Arial;
font-size:10px;
text-decoration:none;
}
#qm0 div, #qm0 ul
{
padding:10px;
margin:-2px 0px 0px;
background-color:transparent;
border-style:none;
}
#qm0 div a, #qm0 ul a
{
padding:3px 10px 3px 5px;
background-color:transparent;
font-size:11px;
border-width:0px;
border-style:none;
}
#qm0 div a:hover
{
background-color:#dadada;
color:#cc0000;
}
#qm0 ul li:hover>a
{
background-color:#dadada;
color:#cc0000;
}
body #qm0 div .qmactive, body #qm0 div .qmactive:hover
{
background-color:#dadada;
color:#cc0000;
}
#qm0 .qmtitle
{
cursor:default;
padding:3px 0px 3px 4px;
color:#444444;
font-family:arial;
font-size:11px;
font-weight:bold;
}
#qm0 .qmdividerx
{
border-top-width:1px;
margin:4px 0px;
border-color:#bfbfbf;
}
#qm0 .qmdividery
{
border-left-width:1px;
height:15px;
margin:4px 2px 0px;
border-color:#aaaaaa;
}
#qm0 .qmritem span
{
border-color:#dadada;
background-color:#f7f7f7;
}
#qm0 .qmritemcontent
{
padding:0px 0px 0px 4px;
}
ul#qm0 li:hover > a
{
background-color:#f7f7f7;
}
ul#qm0 ul
{
padding:10px;
margin:-2px 0px 0px;
background-color:#f7f7f7;
border-width:1px;
border-style:solid;
border-color:#dadada;
}
</style>
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l=0;l<cns.length;l++){if(cns[l].getAttribute("isibulletcss")||cns[l].getAttribute("isibullet"))cn.removeChild(cns[l]);}fi+='<span class="qmritemcontent" style="display:block;border-style:solid;border-width:0px 1px 0px 1px;'+q.opacity+'">'+cn.innerHTML+'</span>';for(var i=size-1;i>=0;i--)fi+=qm_ritem_get_span(size,i,null,ctype);f.innerHTML=fi;f=atags[k].insertBefore(f,atags[k].firstChild);atags[k].hasritem=f;}if(atags[k].cdiv)new qm_ritem_add_rounds(atags[k].cdiv);}};function qm_ritem_get_span(size,i,top,ctype){var q=qmad.ritem;var mlmr;if(i==0){var mo=q.ps[size]+q.mid;if(q.angle)mo=size-i;var fs="";if(qmad.str)fs="<br/>";mlmr=qm_ritem_get_corners(mo,null,top,ctype);return '<span style="border-width:1px 0px 0px 0px;border-style:solid;display:block;font-size:1px;overflow:hidden;line-height:0px;height:0px;margin-left:'+mlmr[0]+'px;margin-right:'+mlmr[1]+'px;'+q.opacity+'">'+fs+'</span>';}else {var md=size-(i);var ih=1;var bs=1;if(!q.angle){if(i>=q.mid)ih=Math.abs(q.mid-i)+1;else 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希望本文所述对大家JavaScript程序设计有所帮助。