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>
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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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