//处理json数组中文问题function arrayRecursive(&$array, $function, $apply_to_keys_also = false){    static $recursive_counter = 0;    if (++$recursive_counter > 1000) {        die(‘possible deep recursion attack‘);    }    foreach ($array as $key => $value) {        if (is_array($value)) {            arrayRecursive($array[$key], $function, $apply_to_keys_also);        } else {            $array[$key] = $function($value);        }        if ($apply_to_keys_also && is_string($key)) {            $new_key = $function($key);            if ($new_key != $key) {                $array[$new_key] = $array[$key];                unset($array[$key]);            }        }    }    $recursive_counter--;}

//直接返回json数组function JSON($array) {    arrayRecursive($array, ‘urlencode‘, true);    $json = json_encode($array);    return urldecode($json);}

//调用$data = array();$data[‘success‘]="false";$data[‘message‘]="用户名不存在，请重新输入";        echo JSON($data);

$.post("ajax.php?mod=member&code=check_user_exist",{username:username},function(data){            var json=$.parseJSON(data);            if(json.success){                alert(json.success);                         }else{                alert(json.success);                    }        });