extjs与php参数交互

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<html> <head> <title>HelloWorld</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link rel="stylesheet" type="text/css" href="../../ext-4.0.7-gpl/resources/css/ext-all.css" > <script type="text/javascript" src="../../ext-4.0.7-gpl/bootstrap.js"></script> <script type="text/javascript" src="../../ext-4.0.7-gpl/locale/ext-lang-zh_CN.js"></script> <script type="text/javascript"> Ext.onReady(function(){ var requestConfig = { url:'loginServer.php', //请求的服务器地址 params:{userName:'lowkey', password:'zq19890319'}, //请求参数 method : "post", callback:function(options, success, response) { var msg=["请求是否成功：", success, "\n", "服务器返回值：", response.responseText]; Ext.Msg.alert("提示", response.responseText); } } Ext.Ajax.request(requestConfig); }); </script> </head> <body> </body> </html><?php $userName = $_POST["userName"]; $password = $_POST["password"]; $msg = ""; if($userName=="lowkey" && $password=="zq19890319") { $msg = "登陆成功"; } else { $msg = "登陆失败"; } echo($msg); ?>