jQuery AJAX JSONP錯誤“意外的令牌”

Question

我正在嘗試在Chrome中進行跨域JSONP調用，但我不斷回復“Uncaught SyntaxError：Unexpected token：”我試過：更改響應內容類型，設置xhr標頭，JSON.stringify，幾乎大多數在這里提供的解決方案，但到目前為止沒有任何工作:-(

 $.ajax({
                type: "POST",
                url: "https://www.virustotal.com/vtapi/v2/url/report",
                crossDomain: true,
                contentType: "application/json; charset=UTF-8",
                dataType: 'jsonp',
                data: {
                    apikey: "*",
                    resource: "http://www.1001freefonts.com/font/BaroqueScript.zip"
                },
                jsonp: false,
                jsonpCallback: receive,
                success: function (data, textStatus, jqXHR) {
                    console.log("Data retrieved: " + data);
                }
            }).done(function () {
                console.log('I think we are done here');
            })
        .error(function (e) {
            console.log(arguments);
            console.log('something went funny here');
        })
        .complete(function (xhr, status) {

            console.log("complete");
        if (status === 'error' || !xhr.responseText) {
            console.log('error');
        }
        else {
            console.log("data found:" + xhr.responseText);
            //...
        }
    });
    });

    function receive(saveData) {
        if (saveData == null) {
            console.log("DATA IS UNDEFINED!");  // displays every time
        }
        console.log("Success is " + saveData);  // 'Success is undefined'
    }

在調試器中，我可以看到響應

{"permalink": "https://www.virustotal.com/url/b5b546fdbb49a2258e951c5e568a52655c65ac56112e39d15af0954a53b36772/analysis/1360339512/", "url": "http://www.1001freefonts.com/font/BaroqueScript.zip", "response_code": 1, "scan_date": "2013-02-08 16:05:12", "scan_id": "b5b546fdbb49a2258e951c5e568a52655c65ac56112e39d15af0954a53b36772-1360339512", "verbose_msg": "Scan finished, scan information embedded in this object", "filescan_id": "b7e13c0242e9690aba1f3da4b73d9c2e99a9b7fd03f542b55e694a34aaf9eca8-1360339519", "positives": 0, "total": 35, "scans": {"CLEAN MX": {"detected": false, "result": "clean site"}, "MalwarePatrol": {"detected": false, "result": "clean site"}, "ZDB Zeus": {"detected": false, "result": "clean site"}, "K7AntiVirus": {"detected": false, "result": "clean site"}, "Quttera": {"detected": false, "result": "clean site"}, "Yandex Safebrowsing": {"detected": false, "result": "clean site"}, "MalwareDomainList": {"detected": false, "result": "clean site"}, "ZeusTracker": {"detected": false, "result": "clean site"}, "zvelo": {"detected": false, "result": "clean site"}, "Google Safebrowsing": {"detected": false, "result": "clean site"}, "BitDefender": {"detected": false, "result": "clean site"}, "Opera": {"detected": false, "result": "clean site"}, "G-Data": {"detected": false, "result": "clean site"}, "C-SIRT": {"detected": false, "result": "clean site"}, "Sucuri SiteCheck": {"detected": false, "result": "clean site"}, "VX Vault": {"detected": false, "result": "clean site"}, "ADMINUSLabs": {"detected": false, "result": "clean site"}, "SCUMWARE.org": {"detected": false, "result": "clean site"}, "Dr.Web": {"detected": false, "result": "clean site"}, "AlienVault": {"detected": false, "result": "clean site"}, "Malc0de Database": {"detected": false, "result": "clean site"}, "SpyEyeTracker": {"detected": false, "result": "clean site"}, "Phishtank": {"detected": false, "result": "clean site"}, "Avira": {"detected": false, "result": "clean site"}, "Antiy-AVL": {"detected": false, "result": "clean site"}, "Comodo Site Inspector": {"detected": false, "result": "clean site"}, "Malekal": {"detected": false, "result": "clean site"}, "ESET": {"detected": false, "result": "clean site"}, "SecureBrain": {"detected": false, "result": "unrated site"}, "Netcraft": {"detected": false, "result": "clean site"}, "ParetoLogic": {"detected": false, "result": "clean site"}, "URLQuery": {"detected": false, "result": "unrated site"}, "Wepawet": {"detected": false, "result": "unrated site"}, "Minotaur": {"detected": false, "result": "clean site"}}}

我已經在http://jsonlint.com/上驗證了它，它表明它是一個有效的JSON。

這是響應標題

cache-control:no-cache
content-encoding:gzip
content-length:695
content-type:application/json
date:Wed, 13 Feb 2013 12:00:33 GMT
server:Google Frontend
status:200 OK
vary:Accept-Encoding
version:HTTP/1.1

任何人有任何想法/建議？

Answer 1

在徹底測試之后，很明顯當ajax期望JSONP作為回報時（由於跨域限制），不可能捕獲JSON對象結果。 即使響應狀態= 200。

我一直在測試使用jQuery AJAX調用，試圖看看結果是否仍然可以捕獲 - 盡管瀏覽器拋出了解析錯誤 - 但它似乎不可能。 看起來響應文本在JS工作完成后到達標題。

正如@Florian F. @Likwid_T @Christoph上面所建議的那樣，一定要使用服務器端腳本才能使其正常工作。 其他開發人員似乎熱衷於使用C＃編寫的代理作為解決方案。

Answer 2

JSONP無法開箱即用。

JSONP通過在script標記中加載結果來繞過跨域限制。

基本上，您的服務器必須支持JSONP。

在發送響應之前，在服務器端執行任何需要執行的操作：

1. 檢查請求是否設置了“_callback”
2. 如果設置，請使用_callback的值包裝內容。
3. 發送您的數據

PHP中的代碼示例：

$responseString = '{"smthing":"val","smthingelse":"val2"}';
if (isset($_REQUEST['_callback'])) {
    $responseString = $_REQUEST['_callback'] . '(' . $responseString . ');';
}

它將使用正確的參數執行你的'done'匿名函數。 （JQuery處理其他所有事情）

Answer 3

Christoph是對的，你需要在你的回調函數中包含你的答案，在你的情況下在PHP文件的末尾：

echo $_GET['receive'] . '(' . json_encode($yourResultObject) . ');';

或者如果你需要一個更復雜的對象

echo $_GET['receive'] . '(' . json_encode(array(name1 => object1, name2 => object2, name3 => object3)) . ');';

你可能需要調整一下，但基本上每當我得到Unexpected令牌幾乎總是一個語法錯誤，使得jQuery沒有得到我的回調函數。