<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$.ajax({url:"demo_ajax_load.txt",async:false,success:function(result){
$("div").html(result);
}});
});
});
</script>
</head>
<body>
<div><h2> AJAX 可以修改文本内容</h2></div>
<button>修改内容</button>
</body>
</html>