html部分代碼
<!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即時自動檢測是否連網</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即時自動檢測是否連網</h1><p>當前網路狀態：<span id="shownetlink"></span></p></body></html>
php部分代碼
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\">網路連接失敗</font>"; }else{ $shownetlink = "<font color=\"#06C\">網路連接正常</font>"; } echo $shownetlink; }
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