class FM(forms.Form):
    user = fields.CharField()
    pwd = fields.CharField()
    email = fields.EmailField()

def fm(request):
    if request.method == "GET":
        obj = FM()
        return render(request, ‘fm.html‘, {‘obj‘: obj})
    elif request.method == "POST":
        # 获取用户所有数据
        # 每条数据请求的验证
        # 成功：获取所有的正确的信息
        # 失败：显示错误信息
        obj = FM(request.POST)  # 生成from表单验证对象实例
        r1 = obj.is_valid()   # 获取obj对象是否有效
        if r1:
            # obj.cleaned_data
            print(r1)
            print(obj.changed_data)

        else:
            print(r1)
            print(obj.errors.as_json())
            # 错误信息字典形式
            #  {"user": [{"message": "This field is required.", "code": "required"}],
            #  "pwd": [{"message": "This field is required.", "code": "required"}],
            #  "email": [{"message": "This field is required.", "code": "required"}]}
            print(obj.errors[‘user‘][0])
        return redirect("/fm/")