<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){ $(".field").change(function(){ $(this).css("background-color","#FFFFCC"); });
});
</script>
</head>
<body>
<p>在某个域被使用或改变时，它会改变颜色。</p>
Enter your name: <input class="field" type="text" />
<p>Car:
<select class="field" name="cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="fiat">Fiat</option>
<option value="audi">Audi</option>
</select>
</p>
</body>
</html>