<Meta http-equiv="Content-Type" content="text/html; charset=utf-8"> PHP+Ajax实时自动检测是否联网

当前网络状态：

PHP;"> 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 = ""; }else{ $shownetlink = ""; } echo $shownetlink; }