django通过ajax发起请求返回JSON格式数据的方法

def checkemail(request):
  user = None
  if request.POST.has_key('email'):
    useremail = request.POST['email']
    result = {}
    user = User.objects.filter(useremail__iexact = useremail)
  if user:
    result = "1"
    result = simplejson.dumps(result)
  else:
    result = "0"
    result = simplejson.dumps(result)
  return HttpResponse(result, mimetype='application/javascript')

这是AJAX部分：