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 ; } |
希望本文所述对大家的php程序设计有所帮助。