关于ajax的jQuery实现

//老师您好，下面是本节课的作业里关于ajax异步刷新的jQuery实现，我对JSONArray的传输以及处理不是很懂，请老师解答一下

//ajax的脚本

<script type="text/javascript">

function query() {

$.ajax({

url:"<%=basePath%>/SelectBookServlet",

type:"post",

data:{

bookID:$("input[name=bookID]").val(),

bookName:$("input[name=bookName]").val(),

categoryName:$("input[name=categoryName]").val()

},

dataType:"json",

success:function(data) {

$("#t_body").empty();

var d = eval(data);

showData(d);

}

});

}

function showData(d) {

for (var i = 0; i < d.length; i++) {

var html = "<tr><td>" + d[i].bookID +"</td><td>" +d[i].bookName + "</td></tr>";

$("#t_body").append(html);

}

}

</script>

//servlet处理器

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String bookID = request.getParameter("bookID");

String bookName = request.getParameter("bookName");

String categoryName = request.getParameter("categoryName");

JSONArray jsonArray = new JSONArray();

List<Book> bookDB = LibDaoImpl.getBookDB();

for (Book book : bookDB) {

if (bookID.equals(book.getBookID()) || bookName.equals(book.getBookName()) 

|| categoryName.equals(book.getCategoryName())) {

jsonArray.put(book);

}

}

response.getOutputStream().write(jsonArray.toString().getBytes("utf-8"));

}