如下所示：
<script type="text/javascript" src="jquery-1.2.6.pack.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var oInputs = $("ul.demo input");
oInputs.each(function(i){
oInputs.eq(i).focus(function(){
oInputs.eq(i).parent().css("background-color","ccf");
}).blur(function(){
oInputs.parent().css("background-color","");
})
});
oInputs.focus(function(){
$(this).css("background-color","ff9").blur(function(){
$(this).css("background-color","");
});
})
})
</script>
</head>
<body>
<ul class="demo">
<li>
<h5>
注册选项</h5>
</li>
<li>用户名:<input type="text" value="" id="name" style="width: 200px" /></li>
<li>密 码:<input type="password" value="" id="pass" style="width: 200px" /></li>
<li>爱 好:<input type="checkbox" value="" />篮球 <input type="checkbox" value="" />足球 <input
type="checkbox" value="" />音乐</li>
</ul>
</script>
</body>
</html>