<script type="text/javascript" src="/js/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(".field").change(function(){
$(this).css("background-color","#FFFFCC");
$("button").click(function(){
<button>激活文本域的 change 事件</button>
<p>Enter your name: <input class="field" type="text" /></p>