Simple code to implement the jquery timer

The project encounters a message module at the top of the navigation bar. Want to achieve, when the message can be timely refresh, showing the number of messages received, the following for you to introduce two good methods, interested friends can refer to the next

Simple code to implement the jquery timer.    Today, the project encounters a message module at the top of the navigation bar. Want to achieve, when the message can be refreshed in a timely manner, showing the number of messages received. Thought for a long time. 2 ways to think about it, 1. Take advantage of STRUTS2 ajax tags.    2. Use jquery.   Struts2 is a bit of a hassle, jquery is simpler with jquery. The following code: to achieve every 3S to the server to obtain data. Then assign the value to the DOM object that you want to display.  The code is as follows: $ (function () {run ();  var interval;  function run () {interval = setinterval (chat, "3000"); function Chat () {$.post ("searchmessage.action", {"Mark": "Receive", "Ajax": "Ajax"},function (data) {$ ("span[name="  Mes ']. html (data.num);  }, "JSON");  $ ("#closeChat"). Click (function () {cleartimeout (interval);    }); });