服务器推送事件EventSource是什么？如何实现长尾词？

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1. [代码] 客户端接收代码 (接收的data是string)javascriptvar source=new EventSource(server-events.php);source.onmessage=function(event) { console.log(JSON.stringify(JSON.parse(event.data)));};source.onopen=function(event) { console.log('连接成功');};

1.[代码]客户端接收代码 (收到的data是string)

var source=new EventSource("server-events.php"); source.onmessage=function(event){ console.log(JSON.stringify(JSON.parse(event.data))) }; source.onopen=function(event){ console.log('[.]start'); }; source.onerror=function(event){ console.log('[.]error'); };

2.[代码]php服务端推送代码

<?php error_reporting(0); require 'req/Mysqlconn.php'; mysql_select_db('TEST_DB',$con); mysql_query('SET NAMES UTF8'); $sql = "SELECT * FROM TEST_TB"; $list = array(); $query = mysql_query($sql); while($r = mysql_fetch_array($query)){ $arraone = array( 'id' =>$r['id'] , 'info' =>$r['info'] ); array_push($list, $arraone); } $back = json_encode($list,JSON_UNESCAPED_UNICODE); header('Content-Type: text/event-stream;charset=utf-8'); header('Cache-Control: no-cache'); echo "data: {$back}\n\n"; flush(); ?>