php flush与ajax 响应只好一次吗

<br />	$.ajax({<br />			type: "get",<br />			url: "./test.php",<br />			beforeSend: function(XMLHttpRequest){<br />				console.log("start Send ");<br />			},<br />			success: function(data, textStatus){<br />				console.log("Success!");<br />			},<br />			complete: function(XMLHttpRequest, textStatus){<br />				console.log("complete");<br />			},<br />			error: function(){<br />				alert("Error");<br />			}<br />	});<br />

<br />ob_start();<br />echo "First team";<br />	ob_flush(); <br />	flush();<br />	sleep(3);<br />echo "Follower";<br />ob_end_clean();<br />