in javascript how to create a login code example

Example 1: login html

{% extends '!!!!!ALERT_CHANGE_THIS_ALERT!!!!!!!/base.html' %}
{% load crispy_forms_tags %}

{% block title %}
<title>Login</title>
{% endblock %}

{% block body %}
<div class="container">
    <div class="row justify-content-center mt-5">
        <div class="col-5 border shadow rounded p-4">
            <h1 class="font-weight-lighter text-center">Login</h1>
            <form method="POST">
                {% csrf_token %}
                {{ form | crispy }}
                <button class="btn btn-outline-secondary btn-block mt-4">
                    Login
                </button>
            </form>
        </div>
    </div>
</div>
{% endblock %}

Example 2: html login scripts

<form action="action_page.php" method="post">
  <div class="imgcontainer">
    <img src="img_avatar2.png" alt="Avatar" class="avatar">
  </div>

  <div class="container">
    <label for="uname"><b>Username</b></label>
    <input type="text" placeholder="Enter Username" name="uname" required>

    <label for="psw"><b>Password</b></label>
    <input type="password" placeholder="Enter Password" name="psw" required>

    <button type="submit">Login</button>
    <label>
      <input type="checkbox" checked="checked" name="remember"> Remember me
    </label>
  </div>

  <div class="container" style="background-color:#f1f1f1">
    <button type="button" class="cancelbtn">Cancel</button>
    <span class="psw">Forgot <a href="#">password?</a></span>
  </div>
</form>