Django:语法错误:意外的令牌<

我正在使用带有jquery的django来使用ajax上传文件。但是，在文件上传后（并且文件确实正确上传;数据库已更新并且它们位于服务器上），javascript 返回并带有SyntaxError: Unexpected token <错误。

我不知道这是javascript中的错误还是django中的错误;我看到的其他问题似乎建议确保信息确实是JSON格式，但在我的情况下，它似乎是正确的格式。我真的不明白为什么会出现错误，因为一切似乎都很好。我的日志中没有错误。

如果我只能看到更有用的错误消息，我会更容易解决问题。

这是我 views.py：

def response_mimetype(request):
    if "application/json" in request.META['HTTP_ACCEPT']:
        return "application/json"
    else:
        return "text/plain"
class JSONResponse(HttpResponse):
    """JSON response class."""
    def __init__(self,obj='',json_opts={},mimetype="application/json",*args,**kwargs):
        content = simplejson.dumps(obj,**json_opts)
        a = super(JSONResponse,self).__init__(content,mimetype,*args,**kwargs)
class UploadedFileCreateView(CreateView):
    model = UploadedFile
    form_class = UploadedFileForm
    def form_valid(self, form):
        self.object = form.save(commit=False)
        self.object.project_id = self.kwargs['proj_key']
        self.object.save()
        f = self.request.FILES.get('file')
        data = [{
            'name': self.object.name(),
            'url': "/uploads/xmlfiles/" + self.object.name().replace(" ", "_"),
            'delete_url': reverse('fileupload:upload-delete',
                kwargs={'pk':self.object.id,
                'proj_key':self.kwargs['proj_key']}),
            'delete_type': "DELETE"}]
        response = JSONResponse(data, {}, response_mimetype(self.request))
        response['Content-Disposition'] = 'inline; filename=files.json'
        return super(UploadedFileCreateView, self).form_valid(form)
    def get_context_data(self, **kwargs):
        context = super(UploadedFileCreateView, self).get_context_data(**kwargs)
        context['files'] = UploadedFile.objects.all()
        context['proj'] = int(self.kwargs["proj_key"])
        return context

这是我的 models.py：

class UploadedFile(models.Model):
    """This represents a file that has been uploaded to the server."""
    STATE_UPLOADED = 0
    STATE_ANNOTATED = 1
    STATE_PROCESSING = 2
    STATE_PROCESSED = 4
    STATES = (
        (STATE_UPLOADED, "Uploaded"),
        (STATE_ANNOTATED, "Annotated"),
        (STATE_PROCESSING, "Processing"),
        (STATE_PROCESSED, "Processed"),
    )
    status = models.SmallIntegerField(choices=STATES,
        default=0, blank=True, null=True) 
    file = models.FileField(upload_to=settings.XML_ROOT)
    project = models.ForeignKey(Project)
    def __unicode__(self):
        return self.file.name
    def name(self):
        return os.path.basename(self.file.name)
    def save(self, *args, **kwargs):
        if not self.status:
            self.status = self.STATE_UPLOADED
        super(UploadedFile, self).save(*args, **kwargs)
    def delete(self, *args, **kwargs):
        os.remove(self.file.path)
        self.file.delete(False)
        super(UploadedFile, self).delete(*args, **kwargs)
    def get_absolute_url(self):
        return u'/upload/projects/%d' % self.id 
class UploadedFileForm(ModelForm):
    class Meta:
        model = UploadedFile
        exclude = ('project',)