代码编辑器：
x
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<meta charset="utf-8">3
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>4
<script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script> 5
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<script>7
$(document).ready(function(){8
$(document).ajaxSuccess(function(e,xhr,opt){9
if (opt.url == "demo_ajax_load.txt") {10
alert("AJAX 请求完成");11
};12
});13
$("button").click(function(){14
$("div").load("demo_ajax_load.txt");15
});16
});17
</script>18
<div><h2>使用 AJAX 修改文本</h2></div>