from django.http import JsonResponse
from captcha.models import CaptchaStoredef ajax_val(request):if  request.is_ajax():cs = CaptchaStore.objects.filter(response=request.GET['response'], hashkey=request.GET['hashkey'])if cs:json_data={'status':1}else:json_data = {'status':0}return JsonResponse(json_data)else:# raise Http404json_data = {'status':0}return JsonResponse(json_data)

  <script>$(function(){$('#id_captcha_1').blur(function(){// #id_captcha_1为输入框的id，当该输入框失去焦点是触发函数
        json_data={'response':$('#id_captcha_1').val(), // 获取输入框和隐藏字段id_captcha_0的数值'hashkey':$('#id_captcha_0').val()}$.getJSON('/ajax_val', json_data, function(data){//ajax发送
            $('#captcha_status').remove()if(data['status']){ //status返回1为验证码正确， status返回0为验证码错误， 在输入框的后面写入提示信息
                $('#id_captcha_1').after('<span id="captcha_status" >*验证码正确</span>')}else{$('#id_captcha_1').after('<span id="captcha_status" >*验证码错误</span>')}});});})</script><script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>

# 只是源码介绍不用写入自己的代码中
def captcha_refresh(request):"""  Return json with new captcha for ajax refresh request """if not request.is_ajax():# 只接受ajax提交raise Http404new_key = CaptchaStore.generate_key()to_json_response = {'key': new_key,'image_url': captcha_image_url(new_key),}return HttpResponse(json.dumps(to_json_response), content_type='application/json')

    $(function(){$('.captcha').css({'cursor': 'pointer'})# ajax 刷新$('.captcha').click(function(){console.log('click');$.getJSON("/captcha/refresh/",function(result){$('.captcha').attr('src', result['image_url']);$('#id_captcha_0').val(result['key'])});});