ajax如何打印header的值

$.ajax({
            url:url,
            type:"post",
            dataType:"jsonp",
            data: {"appId": "MB-ZNBX-0000"},
            headers:{
                appId:"MB-ZNBX-0000",
                accessKey:"1336739651091765:mI/gp8By23ppsE7oAmK+OMXAjWtWxAuBY+7Zp/B4kodXBf6js37lqRqOzaIYUiWuSPlO29Sj9n0oWiPdCTGStA==",
                //平臺(tái)分配給應(yīng)用的唯一key
                    //static String appKey = "436743309a423a57e755250fbc41706c";
                appKey:"e510d4949fd3ce48ff34619f414b1ecc",
                //平臺(tái)分配給應(yīng)用的服務(wù)訪問(wèn)ID
                accessKeyId: "1336739651091765",  
                accessKeySecret:"7fa68fbfa98114d7",
                timestamp:timeStamp,
                sequenceId:"20171107155308000012",
                sign:signf

                    },

                success:function(data){
                    console.log(data);

                }
                    })

一段ajax代碼 一直提示sign簽名有問(wèn)題 無(wú)法調(diào)用接口 想打印一下header里面的值看一下 有沒(méi)有賦值成功 控制臺(tái)里也沒(méi)有辦法看到 請(qǐng)問(wèn)要如何處理