本文实例讲述了js实现顶部可折叠的菜单工具栏效果。分享给大家供大家参考。具体实现方法如下：
<!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><title>可以折叠的菜单工具栏</title><style>html,body{margin:0;}body{url(img.jpg) repeat-x;}ha{margin:0 auto;}img{border:none;}#fx_topToolbar{position:relative;top:-76px;left:0;margin:0 auto;height:92px;background:#0C3E74; width:700px;text-align:center;}#fx_topToolbar .shell{margin:0 auto;padding:13px 0;}#btn_offOn{position:absolute;bottom:-8px;left:20px;height:24px; width:150px;background:url(img34.gif) no-repeat;}#btn_offOn a{display:block;zoom:1;height:24px;position:relative;right:-16px;background:url(tip.gif) no-repeat 100% 0;}</style><script>(JS={$:function(o){return typeof o=="string"?document.getElementById(o):o},on:function(o,type,fn){o.attachEvent?o.attachEvent('on'+type,function(){fn.call(o)}):o.addEventListener(type,fn,false);return JS.on},move:function(who,attr,val,s,fn){var fm=parseInt(who.style[attr])||0;clearInterval(who['timer_'+attr]);var iFx=(function(form,to,s){return function (){return form+=Math[form<to?'ceil':'floor']((to-form)*(s||0.3))};})(fm,val,s);who['timer_'+attr]=setInterval(function (){var v=iFx();who.style[attr]=v+'px';if(v==val){ fn&&fn.call(who);clearInterval(who['timer_'+attr]);};},18);}}).on(window,'load',function (){var Q=JS.$('fx_topToolbar');Q.style.top='-74px';JS.on(JS.$('btn_offOn'),'mouseover',function(){JS.move(Q,'top',0)})(Q,'mouseout',function (){Q.outTimer=setTimeout(function(){JS.move(Q,'top',-74)},10)})(Q,'mouseover',function (){clearTimeout(this.outTimer)});})</script></head><body><div id="fx_topToolbar"><div class="shell"><a href="#" title=""><img src="1.gif" width="231" height="58" alt="" /></a><a href="#" title=""><img src="2.gif" width="231" height="58" alt="" /></a></div><div id="btn_offOn"><a href="#" title=""></a></div></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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