javascript - Read json from php server -

i want read json php server using javascript (not jquery) like

xmlhttp.onreadystatechange=function() {         if (xmlhttp.readystate==4 && xmlhttp.status==200) {              json = xmlhttp.responsetext;             json.parse(json, function (key, val) {                  alert(key + '-'+ val);             });          } } 

in php file do

$data = array(); $data['id'] = '1'; $data['name'] = '2';  print json_encode($data); 

but output is

id-1 name-2 -[object object] // why?? 

how fix thanks

if using normal javascript, want loop through properties of object, u can in javascript for in statement.

<script> var xmlhttp; if (window.xmlhttprequest)   {// code ie7+, firefox, chrome, opera, safari   xmlhttp=new xmlhttprequest();   } else   {// code ie6, ie5   xmlhttp=new activexobject("microsoft.xmlhttp");   } xmlhttp.onreadystatechange=function()   {   if (xmlhttp.readystate==4 && xmlhttp.status==200)     {     alert(xmlhttp.responsetext);      var data = json.parse(xmlhttp.responsetext);     for(key in data) {     alert(key + ' - '+ data[key]); //outputs key , value }         }   } xmlhttp.open("get","sample.php",true);    //say php file name sample.php xmlhttp.send(); </script>