js implémente un effet de menu déroulant à plusieurs niveaux avec des compétences en coins arrondis

L'exemple de cet article décrit comment implémenter un menu déroulant à plusieurs niveaux avec des coins arrondis à l'aide de js. Partagez-le avec tout le monde pour votre référence. Les détails sont les suivants :
Il s'agit d'un menu déroulant noir à plusieurs niveaux avec des coins arrondis, qui peut prendre en charge trois niveaux. Lorsque la souris est placée, vous pouvez voir le menu coulissant. Il appelle une bibliothèque d'empaquetage JS. un peu compliqué, et vous pouvez l'étudier si vous êtes intéressé.
La capture d'écran de l'effet en cours d'exécution est la suivante :
L'adresse de la démo en ligne est la suivante :
http://demo.jb51.net/js/2015/js-down-show-menu-style-codes/
Le code spécifique est le suivant :
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
 <title>下拉菜单</title>
 <!--[imcss] *** Infinite Menus Core CSS: Keep this section in the document head for full validation. -->
<style type="text/css">.imcm ul,.imcm li,.imcm div,.imcm span,.imcm a{text-align:left;vertical-align:top;padding:0px;margin:0;list-style:none outside none;border-style:none;background-image:none;clear:none;float:none;display:block;position:static;overflow:visible;line-height:normal;}.imcm li a img{display:inline;border-width:0px;}.imcm span{display:inline;}.imcm .imclear,.imclear{clear:both;height:0px;visibility:hidden;line-height:0px;font-size:1px;}.imcm .imsc{position:relative;}.imcm .imsubc{position:absolute;visibility:hidden;}.imcm li{list-style:none;font-size:1px;float:left;}.imcm ul ul li{width:100%;float:none !important;}.imcm a{display:block;position:relative;}.imcm ul .imsc,.imcm ul .imsubc {z-index:10;}.imcm ul ul .imsc,.imcm ul ul .imsubc{z-index:20;}.imcm ul ul ul .imsc,.imcm ul ul ul .imsubc{z-index:30;}.imde ul li:hover .imsubc{visibility:visible;}.imde ul ul li:hover .imsubc{visibility:visible;}.imde ul ul ul li:hover .imsubc{visibility:visible;}.imde li:hover ul .imsubc{visibility:hidden;}.imde li:hover ul ul .imsubc{visibility:hidden;}.imde li:hover ul ul ul .imsubc{visibility:hidden;}.imcm .imea{display:block;position:relative;left:0px;font-size:1px;line-height:1px;height:0px;width:1px;float:right;}.imcm .imea span{display:block;position:relative;font-size:1px;line-height:0px;}.dvs,.dvm{border-width:0px}/*\*//*/.imcm .imea{visibility:hidden;}/**/</style><!--[if IE]><style type="text/css">.imcm .imea span{position:absolute;}.imcm .imclear,.imclear{display:none;}.imcm{zoom:1;} .imcm li{curosr:hand;} .imcm ul{zoom:1}.imcm a{zoom:1;}</style><![endif]--><!--[if gte IE 7]><style type="text/css">.imcm .imsubc{background-image:url(ie_css_fix);}</style><![endif]--><!-- ****** Infinite Menus Rounded Corners Add-On ****** -->
<script language="JavaScript" type="text/javascript">
 ulm_round_corner_size_main = 2;
 ulm_round_corner_size_sub = 2;
</script>
<div id="ssimrc" style="position:absolute;visibility:hidden;"><style type="text/css">.imgl .imrc{font-size:1px;line-height:0px;height:1px;border-width:0px;border-style:solid;border-right-width:1px;border-left-width:1px;}.imgl .imbrc{border-width:0px;border-bottom-width:1px;height:0px;}</style></div><!--[if lte IE 6]><style type="text/css">.imgl .imrc{overflow:hidden;}.imgl .imroundcorner{height:1px;}</style><![endif]--><!--[if gte IE 7]><style type="text/css">.imgl .imroundcorner{zoom:1;}</style><![endif]--><script language="JavaScript" type="text/javascript">;function im_round_corners(tb,ms,isget,inner){var size=window["ulm_round_corner_size_"+ms];var pos=0;var wv="";if(!inner)wv+='<div class="imroundcorner" imrctype="'+tb+'" imrcgroup="'+ms+'">';if(tb=="top"){wv+=im_rcs(size,1," imtopspace");for(var i=size-1;i>=0;i--)wv+=im_rcs(i);}else {for(var i=0;i<size;i++)wv+=im_rcs(i);wv+=im_rcs(size,1,"");}if(!inner)wv+='</div>';if(isget)return wv;else document.write(wv);};function im_rcs(pos,is_cap,topclass){if(is_cap)return '<div class="imrbcolor imrc imbrc'+topclass+'" style="margin-left:'+pos+'px;margin-right:'+pos+'px;"></div>';else return '<div class="imrbcolor imrcolor imrc" style="vertical-align:top;margin-left:'+pos+'px;margin-right:'+pos+'px;"></div>';}</script>
<!--end-->
<!--[imstyles] *** Infinite Menu Styles: Keep this section in the document head for full validation. -->
<style type="text/css">
 /* --[[ Main Expand Icons ]]-- */
 #imenus0 .imeam span,#imenus0 .imeamj span {width:9px; height:9px; left:-10px; top:5px; background-repeat:no-repeat;background-position:top left;}
 #imenus0 li:hover .imeam span,#imenus0 li a.iactive .imeamj span {background-repeat:no-repeat;background-position:top left;}
 /* --[[ Sub Expand Icons ]]-- */
 #imenus0 ul .imeas span,#imenus0 ul .imeasj span {background-image:url(images/small_red_pointer.gif); width:7px; height:8px; left:-8px; top:3px; background-repeat:no-repeat;background-position:top left;}
 #imenus0 ul li:hover .imeas span,#imenus0 ul li a.iactive .imeasj span {background-image:url(images/small_red_pointer.gif); background-repeat:no-repeat;background-position:top left;}
 /* --[[ Main Container ]]-- */
 #imouter0 {background-color:#546347; border-style:solid; border-color:#000000; border-width:0px 1px; padding:0px 2px; margin:0px; }
  /* [Rounded Corner Styles] */
  .imrcmain0 .imrcolor {background-color:#546347; }
  .imrcmain0 .imrbcolor {border-color:#444444; }
  .imrcmain0 .imtopspace {height:0px; }
 /* --[[ Sub Container ]]-- */
 #imenus0 li ul {background-color:#cce7bc; border-style:solid; border-color:#a2a2a2; border-width:0px 1px; padding:5px 7px; }
  /* [Rounded Corner Styles] */
  #imenus0 .imrcolor {background-color:#cce7bc; }
  #imenus0 .imrbcolor {border-color:#a2a2a2; }
  #imenus0 .imtopspace {height:6px; }
 /* --[[ Main Items ]]-- */
 #imenus0 li a, #imenus0 .imctitle {color:#ffffff; text-align:center; font-family:Arial; font-size:12px; font-weight:bold; text-decoration:none; border-style:none; border-color:#000000; border-width:0px; padding:2px 5px 2px 12px; }
  /* [hover] - These settings must be duplicated for IE compatibility.*/
  #imenus0 li:hover>a {background-color:#cce7bc; color:#546347; }
  #imenus0 li a.ihover, .imde imenus0 a:hover {background-color:#cce7bc; color:#546347; }
  /* [active] */
  #imenus0 li a.iactive {}
 /* --[[ Sub Items ]]-- */
 #imenus0 ul a, #imenus0 .imsubc li .imctitle {color:#111111; text-align:left; font-size:11px; font-weight:normal; text-decoration:none; border-style:none; border-color:#000000; border-width:1px; padding:2px 5px; }
  /* [hover] - These settings must be duplicated for IE comptatibility.*/
  #imenus0 ul li:hover>a {background-color:transparent; color:#cc0000; }
  #imenus0 ul li a.ihover {background-color:transparent; color:#cc0000; }
  /* [active] */
  #imenus0 ul li a.iactive {background-color:#ffffff; }
  /* [Dividers] */
  #imenus0 .dvs {border-bottom-width:1px; border-style:dotted; border-color:#546347; padding-bottom:4px; margin-bottom:4px; }
</style><!--end-->
</head>
 <body>
<!--|**START IMENUS**|imenus0,inline-->
<!-- ****** Infinite Menus Structure & Links ***** -->
<div class="imrcmain0 imgl" style="width:538px;z-index:999999;position:relative;"><script language="JavaScript" type="text/javascript">im_round_corners("top","main");</script><div class="imcm imde" id="imouter0"><ul id="imenus0">
<li class="imatm" style="width:140px;"><a class="" href="#"><span class="imea imeam"><span></span></span>Who We Are</a>
<div class="imsc"><div class="imsubc" style="width:140px;top:0px;left:0px;"><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul >
 <li><a href="#">Overview</a></li>
 <li><a href="#">Mission & Goals</a></li>
 <li><a href="#">History</a></li>
 <li><a href="#">Management</a></li>
 <li><a href="#">Working at Tyco</a></li>
 <li class="dvs"><a href="#">Press Center</a></li>
 <li><a href="#"><span class="imea imeas"><span></span></span>Board of Directors</a>
  <div class="imsc"><div class="imsubc" style="width:140px;top:-26px;left:127px;"><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul >
  <li><a href="#">Overview</a></li>
  <li><a href="#">Electronics</a></li>
  <li><a href="#">Fire & Security</a></li>
  <li><a href="#">Healthcare</a></li>
  <li><a href="#">Plastics & Adhesives</a></li>
  <li><a href="#">Engineered Producs</a></li>
  <li><a href="#">Tyco Worldwide</a></li>
  </ul><script language="JavaScript" type="text/javascript">im_round_corners("bottom","sub");</script></div></div></li>
 <li class="dvs"><a href="#"><span class="imea imeas"><span></span></span>Worldwide</a>
  <div class="imsc"><div class="imsubc" style="width:140px;top:-26px;left:127px;"><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul >
  <li><a href="#">Europe</a></li>
  <li><a href="#">Asia</a></li>
  <li><a href="#">US & Canada</a></li>
  <li><a href="#">Mexico</a></li>
  <li><a href="#">Australia</a></li>
  <li><a href="#">Middle East</a></li>
  </ul><script language="JavaScript" type="text/javascript">im_round_corners("bottom","sub");</script></div></div></li>
 <li><a href="#">Customers</a></li>
 </ul><script language="JavaScript" type="text/javascript">im_round_corners("bottom","sub");</script></div></div></li>
<li class="imatm" style="width:142px;"><a href="#"><span class="imea imeam"><span></span></span>Our Commitment</a>
<div class="imsc"><div class="imsubc" style="width:142px;top:0px;left:0px;"><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul >
 <li><a href="#">Overview</a></li>
 <li><a href="#">People & Values</a></li>
 <li><a href="#">Governance</a></li>
 <li><a href="#">Community</a></li>
 <li><a href="#">Environmental</a></li>
 </ul><script language="JavaScript" type="text/javascript">im_round_corners("bottom","sub");</script></div></div></li>
<li class="imatm" style="width:125px;"><a href="#"><span class="imea imeam"><span></span></span>Our Business</a>
<div class="imsc"><div class="imsubc" style="width:125px;top:0px;left:0px;"><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul >
 <li><a href="#">Overview</a></li>
 <li><a href="#">Electronics</a></li>
 <li><a href="#">Fire & Security</a></li>
 <li><a href="#">Healthcare</a></li>
 <li><a href="#">Plastics</a></li>
 <li><a href="#">Engineered Producs</a></li>
 <li><a href="#">Tyco Worldwide</a></li>
 </ul>
<script language="JavaScript" type="text/javascript">
im_round_corners("bottom","sub");
</script>
</div></div></li>
<li class="imatm" style="width:125px;"><a href="#"><span class="imea imeam"><span></span></span>Investors</a>
<div class="imsc"><div class="imsubc" style="width:126px;top:0px;left:0px;"><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul >
 <li><a href="#">Overview</a></li>
 <li><a href="#">Stock Quotes</a></li>
 </ul><script language="JavaScript" type="text/javascript">
im_round_corners("bottom","sub");
</script>
</div></div></li>
</ul><div class="imclear"> </div></div><script language="JavaScript" type="text/javascript">im_round_corners("bottom","main");</script></div>
<script language="JavaScript" src="ocscript.js" type="text/javascript"></script>
</body>
</html>