js + php服务器推送see(自定义推送时间)

1 //javascript code
2 
3 var source = new EventSource("./main.php");
4 
5 source.onmessage=function(event){
6 
7     document.write(event.data);
8 
9 }

 1 //main.php
 2 
 3 <?php
 4 header(‘Content-Type: text/event-stream‘);//服务端推送事件特定的MIME类型
 5 header(‘Cache-Control: no-cache‘);//禁止缓存
 6 echo ‘retry:1000‘.PHP_EOL;//推送时间(每多少毫秒推送一次, 默认为3000ms/次)
 7 
 8 echo "data:";
 9 echo Time()."<br/>";
10 echo "\n\n";
11 
12 ?>