相关事例：
<div id="msg"></div>
<script language="javascript" src="jquery.js"></script>
<script language="javascript" src="ping.js"></script>
<script>
$.ping({
url : 'http://www.example.com',
beforePing : function(){$('#msg').html('')},
afterPing : function(ping){$('#msg').html(ping)},
interval : 1
});
</script>
