javascript实现：

top.location.href 顶级窗口的地址 this.location.href 当前窗口的地址

PHP实现：

测试网址: http://localhost/blog/testurl.php?id=5 //获取域名或主机地址 echo $SERVER['HTTPHOST']."
"; #localhost //获取网页地址 echo $SERVER['PHPSELF']."
"; #/blog/testurl.php //获取网址参数 echo $SERVER["QUERYSTRING"]."
"; #id=5 //获取用户代理 echo $SERVER['HTTPREFERER']."
"; //获取完整的url echo 'http://'.$SERVER['HTTPHOST'].$SERVER['REQUESTURI']; echo 'http://'.$SERVER['HTTPHOST'].$SERVER['PHPSELF'].'?'.$SERVER['QUERYSTRING']; #http://localhost/blog/testurl.php?id=5 //包含端口号的完整url echo 'http://'.$SERVER['SERVERNAME'].':'.$SERVER["SERVERPORT"].$SERVER["REQUESTURI"]; #http://localhost:80/blog/testurl.php?id=5 //只取路径 $url='http://'.$SERVER['SERVERNAME'].$SERVER["REQUESTURI"]; echo dirname($url); #http://localhost/blog