jQuery定时刷新div

1.jQuery定时刷新

<script type="text/javascript" language="javascript">  
    $(document).ready(function () {  
        setInterval("startRequest()", 500);//0.5s一次  
    });  
    function startRequest() {  
  
        $.ajax({  
            url: "chatres.php",  
            type: 'POST', 
	    dataType : 'json',
            data: {  
                'fjid': <?php echo $_GET['id'];?>
            },  
            success: function (data) {  
                $("#chatresult").html(data.msg); 
            },  
	    error : function(jqXHR) {
		alert("发生错误：" + jqXHR.status);
	    },
        });  
    }  
</script> 

2.div标签

<div id="chatresult" ></div>

3.php返回值格式

$arr['msg']=$chatresult;
echo json_encode($arr);