jQuery实现定时读取分析xml文件的方法

<?xml version="1.0"?>
<data>
 <page tasks="1" messages="3" notifications="3"/>
</data>

$(document).ready(function() {
 function get_info() {
  $.ajax({
   type: "GET",
   url: "page.xml",
   dataType: "xml",
   cache: false,
   complete: function(doc) {
    var tasks = $(doc.responseText).find("page").attr("tasks");
    var msgs = $(doc.responseText).find("page").attr("messages");
    var notes = $(doc.responseText).find("page").attr("notifications");
    if (tasks != $('#tasks').text() ||
     msgs != $('#messages').text() ||
     notes != $('#notifications').text()) {
     document.title = "Facebook" + ' NEW NOTIFICATON';
    }
    $('#tasks').text(tasks);
    $('#messages').text(msgs);
    $('#notifications').text(notes);
   }
  });
 }
 setInterval(function() {
  get_info();
 }, 5000);
});