<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">

<title>Examples</title>

<meta name="description" content="">

<meta name="keywords" content="">

<script type="text/javascript" src="jquery.js"></script>

<link href="" rel="stylesheet">

</head>

<style type="text/css">

	.nav {

		width:200px;

		position: fixed;

		right:0px;

		top:50%;

	}

	.nav a{

		width:200px;

		height:40px;

		line-height: 40px;

		background: orange;

		display: block;

		text-align: left;

		text-indent: 10px;

	    right:-160px;

		color:#fff;

		position: relative;

	}

	.nav a:nth-of-type(odd){

		background:#cecece;

	}

</style>

<body>

    <div class="nav">

    	<a href="">1</a>

    	<a href="">2</a>

    	<a href="">3</a>

    	<a href="">4</a>

        <a href="">5</a>

    	<a href="">6</a>

    </div>

</body>

</html>

<script type="text/javascript">

	var _nav = $('.nav');

	var _temp;

	_nav.hover(function(){

          $nav = $(this);

          _temp = setTimeout(function(){

          	$nav.find('a').each(function(i){//每个都执行相同的函数，如果没有延迟settimeout就没有延迟效果

          		var $a = $(this);

          		setTimeout(function(){

          			$a.animate({'right':0},200)

          		},50*i)//关键

          	})

          },100);//其实这个函数可以不要，只是为了平缓过渡吧

	},function(){

		if(_temp){clearTimeout(_temp)};

        $nav = $(this);

        _temp = setTimeout(function(){

          	$nav.children('a').each(function(i){

          		var $a = $(this);

          		setTimeout(function(){

          			$a.animate({'right':'-160'},200)

          		},50*i)

          	})

        },100);

	})

</script>