<script type="text/javascript" src="/js/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#b01").click(function(){
htmlobj=$.ajax({url:"/example/jq/test1.txt",async:false});
$("#myDiv").html(htmlobj.responseText);
<div id="myDiv"><h2>通过 AJAX 改变文本</h2></div>
<button id="b01" type="button">改变内容</button>