下拉菜单收不回去了，我是新手菜鸟，求大神帮忙改好发我看看，出主意的我真的看不懂QAQ，谢谢了】<!doctype html><html><head><meta charset="utf-8"><title>树形菜单</title><style>*{ margin:0; padding:0}ul{ list-style:none}a{ text-decoration:none}li a{ display:block; height:30px;line-height:30px; font-size:14px; color:#999; padding-left:2em}.subMenu{ display:none; margin-left:1em}.hasSub>a{ display:block; background-image:url(a1.png); background-repeat:no-repeat; background-position:10px center;color:#666}.showSubmenu>a{ background-image:url(a2.png); background-position:11px center; background-repeat:no-repeat}.ac{ color:#000 !important; background-color:#efefef;}#objTree{ margin:100px; width:260px; padding:10px; border:1px solid #777}</style></head><body><div id="objTree"> <ul class="tree"> <li> <a href="javascript:;">一级菜单</a> <!--二级---------------------------> <ul> <li><a href="javascript:;">二级菜单</a> <!--三级---------------------------> <ul> <li><a href="javascript:;">三级菜单</a></li> </ul> <!--三级---------------------------> </li> </ul> <!--二级---------------------------> </li> </ul></div></body></html><script> var li=document.getElementsByTagName("li"); for(var i=0;i<li.length;i++){ var ul=li[i].getElementsByTagName("ul")[0]; if(ul){ ul.className="subMenu"; li[i].className="hasSub"; } li[i].onclick=function(){ var oul=this.getElementsByTagName("ul")[0]; oul.style.display="block"; }; }</script>
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