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<span>
<a class="mune_1">按钮</a>
<span class="second_mune" style="display:none">内容</span>
</span>
$('.mune_1').hover(function(){
$(this).parent().hover(function(){
$('.second_mune').show();
},function(){
$('.second_mune').hide();
})
})
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<title> js test </title>
</head>
<body>
<a class="mune_1">按钮</a>
<span class="second_mune" style="display:none">内容</span>
<script type="text/javascript">
var et = null;
$('.mune_1').hover(function(){
if(et!=null){
clearTimeout(et);
}
$('.second_mune').show();
},function(){
et = setTimeout(function(){
$('.second_mune').hide();
},100);
})
$('.second_mune').hover(function(){
if(et!=null){
clearTimeout(et);
}
$('.second_mune').show();
},function(){
et = setTimeout(function(){
$('.second_mune').hide();
},100);
})
</script>
</body>
</html>