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CSS+JS感应鼠标展开的的二级下拉菜单
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</div> </li> <li><a href="#" class="a">菜单测试</a> <div> <a href="#">菜单测试</a> <a href="#">菜单测试</a> <a href="#">菜单测试</a> </div> </li> </ul> </div> </div> <script type="text/javascript"> var supnav=document.getElementById("supnav"); var nav=document.getElementById("nav"); var btns=document.getElementsByTagName("li"); var subnavs=nav.getElementsByTagName("div"); var paddingbottom=20; var defaultHeight=0; function drop(obj,ivalue){ var a=obj.offsetHeight; var speed=(ivalue-obj.offsetHeight)/8; a+=Math.floor(speed); obj.style.height=a+"px"; } window.onload=function(){ for(var i=0;i<btns.length;i++){ btns[i].index=i; btns[i].onmouseover=function(){ var osubnav=subnavs[this.index]; var sublinks=osubnav.getElementsByTagName("a"); if(osubnav.firstChild.tagName==undefined){ var itarheight=parseInt(osubnav.childNodes[1].offsetHeight)*sublinks.length+paddingbottom; }else{ var itarheight=parseInt(osubnav.firstChild.offsetHeight)*sublinks.length+paddingbottom; } clearInterval(this.itimer); this.itimer=setInterval(function(){drop(osubnav,itarheight);},30); } btns[i].onmouseout=function(){ var osubnav=subnavs[this.index]; clearInterval(this.itimer); this.itimer=setInterval(function(){drop(osubnav,defaultHeight);},30); } } } </script> </body> </html> <br><br><br><br><br><br> <br><hr>
CSS+JS感应鼠标展开的的二级下拉菜单
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