laravel没有使用ajax获取javascript上传文件

Question

当发出变量文件的警报时，它显示它包含文件，但是当它返回时它显示没有发送文件，下面是我使用的代码

$(document).ready(function (e) {
    var sid = getUrlVars()["id"];    

    var fileInput = document.getElementById('file');
    //get file in variable
    var file = fileInput.files[0];

    $("#uploadimage").on('submit',(function(e) {

        var inputData = new FormData($(this)[0]);

        alert(inputData);
        e.preventDefault();
        $("#message").empty();
        $('#loading').show();
        $.ajax({
            headers: {
                   'Authorization': 'Bearer '+ localStorage.token,
                   'Content-Type': 'application/x-www-form-urlencoded'
               },
            url: "api/v1/uploadReport/" + sid,
            type: "POST",             // Type of request to be send, called as method
            data: fileInput,
            async: false,
            contentType: false,       // The content type used when sending data to the server.
            cache: false,             // To unable request pages to be cached
            processData:false,        // To send DOMDocument or non processed data file it is set to false
            success: function(data)   // A function to be called if request succeeds
            {
                $('#loading').hide();
                $("#message").html(data);
            }
        });
    }));