一个长得很丑的登录和注册

<script>
    $(function () {
        //登录按钮点击ajax请求
        $(".login_btn").click(function () {
            $.ajax({
                url:"",
                type:"post",
                contentType:"json",
                headers:{
                    "X-CSRFToken":$.cookie("csrftoken")
                },
                data:JSON.stringify({
                    user:$("#user").val(),
                    pwd:$("#pwd").val(),
                    validcode:$("#validcode").val(),
                }),
                success:function (response) {
                    if(response.user){
                        location.href = "http://www.baidu.com"
                    }else {
                        $(".error").html(response.err_msg).css("color","red")
                    }
                }
            })
        })

        //点击验证码刷新
        $(".img").click(function () {
            this.src+="?"
        })
    })
</script>

def login(request):
    if request.is_ajax():
        ret = json.loads(request.body)
        user = ret.get("user")
        pwd = ret.get("pwd")
        validcode = ret.get("validcode")
        res = {"user":None,"err_msg":""}
        if validcode.upper() == request.session.get("keep_str").upper():
            user_obj = auth.authenticate(username=user,password=pwd)
            if user_obj:
                res["user"] = user
            else:
                res["err_msg"] = "用户或密码错误！"
        else:
            res["err_msg"] = "验证码错误！"
        return JsonResponse(res)
    else:
        return render(request,"login.html")

def get_valid_img(request):
    # 生成验证码
    # 引入图片模块，画笔，字体
    from PIL import Image,ImageDraw,ImageFont
    from io import BytesIO

    def get_random_color():
        return (random.randint(0,255),random.randint(0,255),random.randint(0,255))

    img = Image.new("RGB",(350,38),get_random_color())
    dram = ImageDraw.Draw(img)
    font = ImageFont.truetype("static/font/kumo.ttf",32)
    keep_str = ""
    for i in range(6):
        random_num = str(random.randint(0,9))
        random_upperalf = chr(random.randint(65,90))
        random_loweralf = chr(random.randint(97,122))
        random_char = random.choice([random_num,random_loweralf,random_upperalf])
        dram.text((i*30+50,0),random_char,get_random_color(),font=font)
        keep_str += random_char
    # 线与点
    # width=350
    # height=38
    # for i in range(100):
    #     x1=random.randint(0,width)
    #     x2=random.randint(0,width)
    #     y1=random.randint(0,height)
    #     y2=random.randint(0,height)
    #     draw.line((x1,y1,x2,y2),fill=get_random_color())
    #
    # for i in range(500):
    #     draw.point([random.randint(0, width), random.randint(0, height)], fill=get_random_color())
    #     x = random.randint(0, width)
    #     y = random.randint(0, height)
    #     draw.arc((x, y, x + 4, y + 4), 0, 90, fill=get_random_color())
    # 写与读
    f = BytesIO()
    img.save(f,"png")
    data = f.getvalue()
    # 将验证码存在session中
    request.session["keep_str"] = keep_str

    return JsonResponse(data)

<h3>注册界面</h3>
<div class="container">
    <div class="row">
        <div class="col-md-8 col-md-offset-2">
            <form action="" method="post">
                {% csrf_token %}
                {% for field in form %}
                    <div class="form-group">
                        <label for="{{ field.id }}">{{ field.label }}</label>
                        {{ field }}
                        <span class="error"></span>
                    </div>
                {% endfor %}
                <input type="button" class="btn btn-primary pull-right reg_btn" value="注册">
            </form>
        </div>
    </div>
</div>
<script>
    $(function () {
        $(".reg_btn").click(function () {
            $.ajax({
            url:"",
            type:"post",
            contentType:"json",
            headers:{
                "X-CSRFToken":$.cookie("csrftoken")
            },
            data:JSON.stringify({
                username:$("#id_username").val(),
                password:$("#id_password").val(),
                r_password:$("#id_r_password").val(),
                email:$("#id_email").val(),
            }),
            success:function (response) {
                if (response.status == 200){
                    location.href = "{% url "login" %}"
                }else if(response.status == 201){
                    //清除错误
                    $(".error").html("");
                    $(".form-control").removeClass("has-error")
                    //展示新的错误
                    $.each(response.err_msg,function (i,j) {
                        $("#id_"+i).next().html(j[0]).css("color","red").parent().addClass("has-error")
                    })
                }
            }
        })
        })

    })
</script>

class UserForm(forms.Form):
    username = forms.CharField(min_length=5,label="用户名",
                               error_messages={
                                   "required": "用户名不能为空！",
                                   "min_length": "用户名不能少于5位！"
                               }
                               )
    password = forms.CharField(min_length=5,label="密码",widget=widgets.PasswordInput(),
                               error_messages={
                                   "required":"密码不能为空！",
                                   "min_length":"密码不能少于5位！"
                               })
    r_password = forms.CharField(min_length=5,label="确认密码",widget=widgets.PasswordInput(),
                                 error_messages={
                                     "required": "确认密码不能为空！",
                                     "min_length": "确认密码不能少于5位！"
                                 }
                                 )
    email = forms.EmailField(label="邮箱",widget=widgets.EmailInput(),
                             error_messages={
                                 "required":"邮箱不能为空！",
                                 "invalid":"邮箱格式错误！"
                             })

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        for filed in self.fields.values():
            filed.widget.attrs.update({‘class‘: ‘form-control‘})

    def clean_username(self):
        val = self.cleaned_data.get("username")
        user_obj = UserInfo.objects.filter(username=val).first()
        if user_obj:
            raise ValidationError("该用户名已经存在！")
        else:
            return val

    def clean_password(self):
        val = self.cleaned_data.get("password")
        if val.isdigit():
            raise ValidationError("密码不能是纯数字！")
        else:
            return val

    def clean_email(self):
        val = self.cleaned_data.get("email")
        res = re.search("\w+@163.com$",val)
        if res:
            return val
        else:
            raise ValidationError("邮箱必须是163邮箱！")

    def clean(self):
        password = self.cleaned_data.get("password")
        r_password = self.cleaned_data.get("r_password")
        if password and r_password and password != r_password:
            # 给全局钩子的错误信息命名，不用再使用默认的__all__
            self.add_error("r_password",ValidationError("两次输入的密码不一致！"))
        else:
            return self.cleaned_data

def reg(request):
    # 注册功能
    if request.method == "POST":
        ret = json.loads(request.body)
        form = UserForm(ret)
        res = {"status":200,"err_msg":""}
        if form.is_valid():
            del ret["r_password"]
            UserInfo.objects.create_user(**ret)
        else:
            res["status"] = 201
            res["err_msg"] = form.errors
        return JsonResponse(res)
    else:
        form = UserForm()
        return render(request,"reg.html",{"form":form})