ajax調用返回php接口返回json數據

php代碼如下：

<?php

    header('Content-Type: application/json');
    header('Content-Type: text/html;charset=utf-8');

    $email = $_GET['email'];

    $user = [];

    $conn = @mysql_connect("localhost","Test","123456") or die("Failed in connecting database");
    mysql_select_db("Test",$conn);
    mysql_query("set names 'UTF-8'");
    $query = "select * from UserInformation where email = '".$email."'";
    $result = mysql_query($query);
    if (null == ($row = mysql_fetch_array($result))) {
        echo $_GET['callback']."(no such user)";
    } else {
        $user['email'] = $email;
        $user['nickname'] = $row['nickname'];
        $user['portrait'] = $row['portrait'];
        echo $_GET['callback']."(".json_encode($user).")";
    }

?>

js代碼如下:

<script>
        $.ajax({
            url: "http://test.localhost/UserInterfaceForChatroom/[email protected]",
            type: "GET",
            dataType: 'jsonp',
            //            crossDomain: true,
            success: function (result) {
                //                data = $.parseJSON(result);
                //                alert(data.nickname);
                alert(result.nickname);
            }
        });
    </script>

其中遇到了兩個問題:

1.第一個問題:

Uncaught SyntaxError: Unexpected token :

解決方案如下:

This has just happened to me, and the reason was none of the reasons above. I was using the jQuery command getJSON and adding callback=? to use JSONP (as I needed to go cross-domain), and returning the JSON code {"foo":"bar"} and getting the error.

This is because I should have included the callback data, something like jQuery17209314005577471107_1335958194322({"foo":"bar"})

Here is the PHP code I used to achieve this, which degrades if JSON (without a callback) is used:

$ret['foo'] = "bar";
finish();

function finish() {
    header("content-type:application/json");
    if ($_GET['callback']) {
        print $_GET['callback']."(";
    }
    print json_encode($GLOBALS['ret']);
    if ($_GET['callback']) {
        print ")";
    }
    exit; 
}

Hopefully that will help someone in the future.

2.第二個問題:

解析json數據。從上面的javascript中可以看到，我沒有使用jquery.parseJSON()這些方法，開始使用這些方法，但是總是會報

VM219:1 Uncaught SyntaxError: Unexpected token o in JSON at position 1

的錯誤，後來不用jquery.parseJSON()這個方法，反而一切正常。不知爲何。