django request.POST is None

This is views.py

class RegisterView(View):
    def get(self,request):
        register_form = RegisterForm()
        return render(request,'register.html',{'register_form':register_form})

    def post(self,request):
        register_form = RegisterForm(request.POST)
        if register_form.is_valid():
            pass

class LoginView(View):
    def get(self,request):
        return render(request,'login.html',{})
    def post(self,request):
        login_form = LoginForm(request.POST)
        if login_form.is_valid():
            user_name = request.POST.get("username", '')
            pass_word = request.POST.get("password", '')
            user = authenticate(username=user_name, password=pass_word)
            if user is not None:
                login(request, user)
                return render(request, 'index.html') 
            else:
                return render(request, 'login.html', {"msg": "User name or password error!"})
        else:
            return render(request, 'login.html', {'login':login_form})

Why does register_form = RegisterForm(request.POST) and login_form = LoginForm(request.POST) return empty,I tried many ways to solve it but failed, so how should I write it?

this is forms.py

from django import forms
from captcha.fields import CaptchaField

class LoginForm(forms.Form):
    username = forms.CharField(required=True) 
    password = forms.CharField(required=True, min_length=5)  

class RegisterForm(forms.Form):
    email = forms.EmailField(required=True)
    password = forms.CharField(required=True,min_length=5)
    captcha = CaptchaField(error_messages={"invalid":'captcha is error'})


this is login.html

<!DOCTYPE html>
<html>

<head>
	<meta charset="UTF-8">
    <meta name="renderer" content="webkit">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" >
	<title>mxonline</title>
	<link rel="stylesheet" type="text/css" href="/static/css/reset.css">
	<link rel="stylesheet" type="text/css" href="/static/css/login.css">
</head>
<body>
<div class="dialog" id="jsDialog">

<div class="successbox dialogbox" id="jsSuccessTips">
    <h1>successful</h1>
    <div class="close jsCloseDialog"><img src="/static/images/dig_close.png"/></div>
    <div class="cont">
        <h2>submit successful!</h2>
        <p></p>
    </div>
</div>
<div  class="noactivebox dialogbox" id="jsUnactiveForm" >
    <h1>Email verification prompt</h1>
    <div class="close jsCloseDialog"><img src="/static/images/dig_close.png"/></div>
    <div class="center">
        <img src="/static/images/send.png"/>
        <p>We have already sent your email to you<span class="green" id="jsEmailToActive">[email protected]</span>Send email, <br/> to ensure your account security, please check email in time</p>
        <p class="a"><a class="btn" id="jsGoToEmail" target="_blank" href="http://mail.qq.com">Check the mailbox</a></p>
        <p class="zy_success upmove"></p>
        <p style="display: none;" class="sendE2">You can check your spam and the filtered message, and you can send it again(<span class="c5c">60s</span>)</p>
        <p class="sendE">You can check your spam and filtered emails,<br/>Can also be<span class="c5c green" id="jsSenEmailAgin" style="cursor: pointer;">Send the validation email again</span></p>
    </div>
</div>
</div>
<div class="bg" id="dialogBg"></div>
<header>
    <div class="c-box fff-box">
        <div class="wp header-box">
            <p class="fl hd-tips">mxonlie</p>
            <ul class="fr hd-bar">
                <li>tel:<span>33333333</span></li>
                <li class="active"><a href="login.html">[login]</a></li>
                <li><a href="register.html">[registration]</a></li>
            </ul>
        </div>
    </div>
</header>
<section>
    <div class="c-box bg-box">
        <div class="login-box clearfix">
            <div class="hd-login clearfix">
                <a class="index-logo" href="index.html"></a>
                <h1>login</h1>
                <a class="index-font" href="index.html">index</a>
            </div>
            <div class="fl slide">
                <div class="imgslide">
                    <ul class="imgs">
                            <li><a href=""><img width="483" height="472" src="/static/images/mysql.jpg" /></a></li>
                            <li><a href=""><img width="483" height="472" src="/static/images/mysql.jpg" /></a></li>
                            <li><a href=""><img width="483" height="472" src="/static/images/mysql.jpg" /></a></li>
                    </ul>
                </div>
                <div class="unslider-arrow prev"></div>
                <div class="unslider-arrow next"></div>
            </div>
            <div class="fl form-box">
                <h2>login</h2>
                <form action="/login/" method="post" autocomplete="off">
                    <input type='hidden' name='csrfmiddlewaretoken' value='mymQDzHWl2REXIfPMg2mJaLqDfaS1sD5' />
                    <div class="form-group marb20 {% if login_form.errors.username %}errorput{% endif %}">
                        <label>&nbsp;username&nbsp</label>
                        <input name="username" id="account_l" type="text" placeholder="Mobile phone number/mailbox" />
                    </div>
                    <div class="form-group marb8 {% if login_form.errors.username %}errorput{% endif %}">
                        <label>password</label>
                        <input name="password" id="password_l" type="password" placeholder="Please enter your password" />
                    </div>
                    <div class="error btns login-form-tips" id="jsLoginTips">{% for key,error in login_form.errors.items %}{{ error }}{% endfor %}{{ msg }}</div>
                     <div class="auto-box marb38">

                        <a class="fr" href="forgetpwd.html">Forget password?</a>
                     </div>
                     <input class="btn btn-green" id="jsLoginBtn" type="submit" value="Login immediately > " />
{#                <input type='hidden' name='csrfmiddlewaretoken' value='5I2SlleZJOMUX9QbwYLUIAOshdrdpRcy' />#}
                    {% csrf_token %}
                </form>
                <p class="form-p">No online account?<a href="register.html">[Register now]</a></p>
            </div>
        </div>
    </div>
</section>
<script src="/static/js/jquery.min.js" type="text/javascript"></script>
<script src="/static/js/unslider.js" type="text/javascript"></script>
<script src="/static/js/login.js"  type="text/javascript"></script>

</body>
</html>


The question of register_form = RegisterForm (request.post) has been resolved, but login_form = login_form = LoginForm (request.post) is still empty,so I just uploaded login.html

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