JS仿QQ的展开/折叠菜单

2024-09-05 12:19:27

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仿QQ菜单风格一样的下拉菜单，点击后展开或折叠，可以无限扩展菜单单元，JS会自动添加对象，并加以控制，代码也不算复杂，修改方便，而且很容易看懂，或许你以后能用得上吧！

<!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><title>仿QQ展开菜单</title><meta http-equiv="content-type" content="text/html;charset=gb2312"><style type="text/css">table{width:100px;overflow:hidden;}#control,#control table,#control table td{font-size:12px;}#control{width:100px;background-color:#ccc;font-size:12px;color:#333333;text-align:center;}#control table{width:100px;height:20px;overflow:hidden;}#control table li{list-style:none;height:20px;line-height:20px;overflow:hidden;}#control table .tabTit{background:#E0E8B8;}#control a{font-weight:normal;font-size:24px;color:#6F7848;text-decoration:none;padding-right:10px;}#control .testLink{font-weight:bold;font-size:12px;}.test{width:100px;background-color:#f6f6f6;overflow:hidden;}.test li{list-style:none;color:#000;font-size:13px;line-height:20px;}#control table,.test table{margin:0 auto;text-align:center;}.style1{font-size:8px;color:#fff;}</style><script language="javascript">function $G(Read_Id) { return document.getElementById(Read_Id) }var openedObjId=nullfunction Effect(ObjectId){	if (openedObjId){		$G(openedObjId+"tab").innerHTML = "+";		Start(openedObjId,'Close');	}	if(openedObjId!=ObjectId){		$G(ObjectId+"tab").innerHTML = "-";		Start(ObjectId,'Opens');		openedObjId=ObjectId	}	else openedObjId=null}function Start(ObjId,method){var BoxHeight = $G(ObjId).offsetHeight; //对象高度var MinHeight = 5;//定义最小高度var MaxHeight = 130;//定义最大高度var BoxAddMax = 1;//递增量初始值var Every_Add = 0.15;//每次的递(减)增量[数值越大速度越快]var Reduce    = (BoxAddMax - Every_Add);var Add       = (BoxAddMax + Every_Add);//折叠if (method == "Close"){var Alter_Close = function(){//构建虚拟的[递减]循环	BoxAddMax /= Reduce;	BoxHeight -= BoxAddMax;	if (BoxHeight <= MinHeight){		$G(ObjId).style.display = "none";		window.clearInterval(BoxAction);	}	else $G(ObjId).style.height = BoxHeight;}var BoxAction = window.setInterval(Alter_Close,1);}//展开else if (method == "Opens"){var Alter_Opens = function(){	BoxAddMax *= Add;	BoxHeight += BoxAddMax;	if (BoxHeight >= MaxHeight){		$G(ObjId).style.height = MaxHeight;		window.clearInterval(BoxAction);	}else{	$G(ObjId).style.display= "block";	$G(ObjId).style.height = BoxHeight;	}}var BoxAction = window.setInterval(Alter_Opens,1);}}</script></head><body><div id="control">  <table width="100%" border="0" cellpadding="0" cellspacing="0">    <tr><td width="100%" align="center" class="tabTit" onClick="Effect('test');"><li id="testtab" style="float:right">+</li><li style="float:left">网站首页</li></td>    </tr>  </table></div><div id="test" class="test" style="display:none;">  <table width="100%" border="0" cellpadding="4" cellspacing="0" bgcolor="#EEEEEE">    <tr>      <td colspan="3" align="center" valign="top"><ul><li>游戏娱乐</li><li>媒体网络</li><li>窗体界面</li><li>算法相关</li></ul></td>    </tr>  </table></div><br><div id="control">  <table width="100%" border="0" cellpadding="0" cellspacing="0">    <tr>      <td width="100%" align="center" class="tabTit" onClick="Effect('test1');" ><li id="test1tab" style="float:right">+</li><li style="float:left">JAVA源代码</li></td>    </tr>  </table></div><div id="test1" class="test" style="display:none;">  <table width="100%" border="0" cellpadding="4" cellspacing="0" bgcolor="#EEEEEE">    <tr>      <td colspan="3" align="center" valign="top"><ul><li>系统相关</li><li>综合应用</li><li>文件操作</li></ul></td>    </tr>  </table></div><br><div id="control">  <table width="100%" border="0" cellpadding="0" cellspacing="0">    <tr>      <td width="100%" align="center" class="tabTit" onClick="Effect('test2');"><li id="test2tab" style="float:right">+</li><li style="float:left">JAVA源代码</li></td>    </tr>  </table></div><div id="test2" class="test" style="display:none;">  <table width="100%" border="0" cellpadding="4" cellspacing="0" bgcolor="#EEEEEE">    <tr>      <td colspan="3" align="center" valign="top"><ul><li>书籍源码</li><li>初学实例</li><li>类库组件</li></ul></td>    </tr>  </table></div></body></html>

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