<table>
  <thead>
    <tr>
      <td>学号</td>
      <td>姓名</td>
      <td>班别</td>
      <td>性别</td>
      <td>电话</td>
    </tr>
  </thead>
  <tbody></tbody>
</table>
<input id="btnget" type="button" value="加载数据" />

$(function () {
  $("#btnget").click(function () {
    $.ajax({
      type: "post",
      dataType: "json",
      url: "data.ashx",
      success: function (msg) {
        var str = "";
        for (i in msg) {
          str += "<tr><td>" + msg[i].id + "</td><td>" + msg[i].name + "</td><td>" + msg[i].cla + "</td><td>" + msg[i].sex + "</td><td>" + msg[i].tel + "</td></tr>";
        }
        $("tbody").append(str);
      }
    });
  });
});

<style type="text/css">
  table {
    border-collapse: collapse;
  }
  table td {
    text-align: center;
    border: 1px solid gray;
    padding: 3px 10px;
  }
</style>

string data = "[{\"id\":\"2010324268\",\"name\":\"林宇\",\"cla\":\"10软件\",\"sex\":\"男\",\"tel\":\"13800138000\"},{\"id\":\"2010324256\",\"name\":\"李四\",\"cla\":\"10网络\",\"sex\":\"女\",\"tel\":\"10010\"},{\"id\":\"2010324264\",\"name\":\"张三\",\"cla\":\"10软件\",\"sex\":\"男\",\"tel\":\"10086\"}]";
context.Response.Write(data);