javascript实现超炫的向上滑行菜单实例

前端技术 2023/09/06 JavaScript

本文实例讲述了javascript实现超炫的向上滑行菜单。分享给大家供大家参考。具体如下：

<!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>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />
<title>JS实现文字上下滑动导航</title>
<style type=\"text/css\"> 
body { margin:0; background:#66FF99; }
ul { padding-left:0; margin:0; }
li { list-style:none; }
#nav { height:40px; background:#900; margin-top:50px; }
#nav ul { width:240px; height:40px; margin:0 auto; }
#nav li {height:40px; width:240px;}
#nav a { float:left; width:240px;position:relative; height:40px; overflow:hidden; font-size:14px; color:#e0e03a; text-decoration:none; cursor:pointer; }
#nav strong { float:left;width:240px; }
#nav span { float:left;width:200px; padding:0 20px; height:40px; line-height:40px; background:#900; clear:both; white-space:nowrap;}
#nav .active,#nav .current span { background:#600; color:#fff; }
#nav .current .active { color:#e0e03a; }
</style>
<script> 
window.onload=function()
{
 var oDiv=document.getElementById(\'nav\');
 var aStrong=oDiv.getElementsByTagName(\'strong\');
 var aA=oDiv.getElementsByTagName(\'a\');
 var iTarget=oDiv.getElementsByTagName(\'li\')[0].offsetHeight;
 for(var i=0; i<aStrong.length; i++)
 {
  aA[i].style.width=aStrong[i].style.width=aStrong[i].getElementsByTagName(\'span\')[0].offsetWidth+\'px\';
  aStrong[i].style.position=\'absolute\';
  aStrong[i].style.top=aStrong[i].style.left=0;
  aStrong[i].onmouseover=function()
  {
   startMove(this, -iTarget);
  };
  aStrong[i].onmouseout=function()
  {
   startMove(this, 0);
  };
 }
};
function startMove(obj,target)
{
 clearInterval(obj.iTime);
 obj.iTime=setInterval(function(){
  if(obj.offsetTop==target)
  {
   clearInterval(obj.iTime);
  }
  else
  {
   var iSpeed=(target-obj.offsetTop)/4;
   iSpeed=iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);
   obj.style.top=obj.offsetTop+iSpeed+\'px\';
  }
 }, 30);
}
</script>
</head>
<body>
<div id=\"nav\">
 <ul>
  <li class=\"current\">
   <a href=\"#\">
    <strong>
     <span>首页</span>
     <span class=\"active\">首页</span>
    </strong>
   </a>
  </li>
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    <strong>
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    <strong>
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     <span class=\"active\">联系妙味</span>
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</div>
</body>
</html>

希望本文所述对大家的javascript程序设计有所帮助。

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