ajax操作json数组，实现局部刷新

<?php //header('Content-type:text/json;charset=utf-8'); $username=$_POST['username']; $password=$_POST['password']; $data='{username:"' . $username . '",password:"' . $password .'"}'; // $data= {'username':'user','password':'pass'}; //$str=json_encode($data); // $json={"name":"yovae","password":"12345"}; echo json_encode($data); //echo $data;