js + php服务器推送see(自定义推送时间)

//javascript code

var source = new EventSource("./main.php");

source.onmessage=function(event){

    document.write(event.data);

}

//main.php

<?php
header('Content-Type: text/event-stream');//服务端推送事件特定的MIME类型
header('Cache-Control: no-cache');//禁止缓存
echo 'retry:1000'.PHP_EOL;//推送时间(每多少毫秒推送一次, 默认为3000ms/次)

echo "data:";
echo Time()."<br/>";
echo "\n\n";

?>