本文实例讲述了PHP+Ajax实时自动检测是否联网的方法。分享给大家供大家参考。具体实现方法如下:
html部分代码:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" > <html xmlns= "http://www.w3.org/1999/xhtml" > <head> <title>PHP+Ajax实时自动检测是否联网</title> <meta http-equiv= "Content-Type" content= "text/html; charset=utf-8" > <script type= "text/javascript" > <!-- var xmlHttp; function createXMLHttpRequest(){ if (window.ActiveXObject){ xmlHttp = new ActiveXObject( "Microsoft.XMLHTTP" ); } else if (window.XMLHttpRequest){ xmlHttp = new XMLHttpRequest(); } } function start(){ createXMLHttpRequest(); var url= "getNetLink" ; xmlHttp.open( "GET" ,url,true); xmlHttp.onreadystatechange = callback; xmlHttp.send(null); } function callback(){ if (xmlHttp.readyState == 4){ if (xmlHttp.status == 200){ document.getElementById( "shownetlink" ).innerHTML = xmlHttp.responseText; setTimeout( "start()" ,8000); } } } // --> </script> </head> <body onload= "start();" > <h1>PHP+Ajax实时自动检测是否联网</h1> <p>当前网络状态:<span id= "shownetlink" ></span></p> </body> </html> |
php部分代码:
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public function getNetLink(){ header( "cache-control:no-cache,must-revalidate" ); header( "Content-Type:text/html;charset=utf-8" ); $file = fopen ( "http://www.baidu.com/" , "r" ); if (! $file ){ $shownetlink = "<font color=\"red\">网络连接失败</font>" ; } else { $shownetlink = "<font color=\"#06C\">网络连接正常</font>" ; } echo $shownetlink ; } |
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