使用jquery ajax请求解析xml

I have this xml document:

我有这个xml文档:

<?xml version="1.0" encoding="utf-8"?>
<root>
<chapter>
<lesson>message 1</lesson> 
<lesson>message 2</lesson>
<lesson>message 3</lesson>
<lesson>message 4</lesson>
<lesson>message 5</lesson>
<lesson>message 6</lesson>
<lesson>message 7</lesson>
<lesson>message 8</lesson>
<lesson>message 9</lesson>
<lesson>message 10</lesson>
<lesson>message 11</lesson>
</chapter>
</root>
<?xml