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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希望本文所述对大家的php程序设计有所帮助。