javascript - Improve this Jquery toggle menu (responsive) -

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i want improve jquery toggle menu (responsive).

first part:

i want when resize window under 768px , click hamburger toggle menu (hamburger icon changes x icon) full "nav ul" menu turn visible in block style , still visible when resize window until break-point 768px, disappears.

second part:

when resize down 768px , under, "nav ul" must visible in block style , toggle menu icon must "x" (not hamburger).

(function($, window, document, undefined) {    'use strict';      $(function() {        $(".menu_bar").click(function() {        $(this).toggleclass("active");        $("#mobilemenu").slidetoggle(100);      });    });    $(window).on("resize", function() {      if ($(this).width() > 768) {        $("#mobilemenu").show();        $(".menu_bar").removeclass("active");        } else {        $(".menu_bar").removeclass("active");        $("#mobilemenu").hide();      }    });  })(jquery, window, document);
.container{   padding:10px;    }  .menu_bar{  display: none;  }  #header{      background: #fff;  }  .header{  display:flex;  justify-content: space-between;  align-items: center;  }  .header .logo{  font-family: 'ubuntu', sans-serif;  padding: 20px 0;  max-width: 288px;  }  nav ul li{  float: left;  }    nav ul li a{  font-family: 'ubuntu', sans-serif;  font-weight: lighter;  font-size: 1.2em;  -webkit-font-smoothing: antialiased;  -moz-osx-font-smoothing: grayscale;  color: #585858;  display: block;  padding: 10px 14px;  transition: 0.3s ease;  }  nav ul li{  margin-left: 4px;  }  nav ul li a.btn_active{  margin-left: 0px;  }  nav ul li a:hover{  font-family: 'ubuntu', sans-serif;  background: #028a9b;  font-weight: lighter;  color: #fff;  border-radius: 2px;  }  nav ul li .active:hover{  font-family: 'ubuntu', sans-serif;  background: #028a9b;  font-weight: lighter;  color: #fff;  border-radius: 2px;  }  nav ul li span{  margin: 10px 2px 0 2px;  float:left;  width:1px;  height:24px;  background: #c1c1c1;  display: block;  content: '';  }    @media (max-width: 768px){      .header img {      width: 75%;      margin-top: 6px;      }      .menu_bar{      position: fixed;      top: 30px;      right: 10px;      display: block;      width: 40px;      height: 40px;      cursor: pointer;      z-index:1000;      }      .menu_bar span.hamburguer{      position: absolute;      display: block;      width: 28px;      height: 1px;      top: 12px;      left: 0;      background: #028a9b;      -webkit-transition: background 0s 0.3s;      transition: background 0s 0.3s      }      .menu_bar span.hamburguer::before{      position: absolute;      display: block;      left: 0;      width: 100%;      height: 1px;      background-color: #028a9b;      content: "";      top: -8px;      -webkit-transition-duration: 0.3s, 0.3s;     transition-duration: 0.3s, 0.3s;     -webkit-transition-delay: 0.3s, 0s;     transition-delay: 0.3s, 0s;     -webkit-transition-property: top,     -webkit-transform;     transition-property: top, transform;      }      .menu_bar span.hamburguer::after{      position: absolute;      display: block;      left: 0;      width: 100%;      height: 1px;      background-color: #028a9b;      content: "";      top: 8px;      -webkit-transition-duration: 0.3s, 0.3s;      transition-duration: 0.3s, 0.3s;      -webkit-transition-delay: 0.3s, 0s;      transition-delay: 0.3s, 0s;      -webkit-transition-property: bottom,      -webkit-transform;      transition-property: bottom, transform;      }      .menu_bar.active span.hamburguer{      background: none;      }      .menu_bar.active span.hamburguer::before{      background: #028a9b;      top:0;      -webkit-transform: rotate(45deg);      -ms-transform: rotate(45deg);      transform: rotate(45deg);      -webkit-transition-delay: 0s, 0.3s;      transition-delay: 0s, 0.3s;      }      .menu_bar.active span.hamburguer::after{      background: #028a9b;      top: 0;      -webkit-transform: rotate(-45deg);      -ms-transform: rotate(-45deg);      transform: rotate(-45deg);      -webkit-transition-delay: 0s, 0.3s;      transition-delay: 0s, 0.3s;      }        #mobilemenu{      display:none;      }      nav{      position: absolute;      z-index: 20000;      top: 86px;      width: 100%;      left: 0%;        }      nav ul{      width: 100%;      background: #ececec;      height: 100%;      padding:0 0 100% 0;      height: 100%;      opacity: 0.95;      }      .btn_active{      border:none;      }      nav ul li{      display: block;      width: 100%;      text-align: center;       border-bottom: 1px solid #c3c3c3;       padding:0;      }      nav ul li:nth-child(1){       border-bottom: 1px solid #c3c3c3;       border-top: 1px solid #c3c3c3;      }      nav ul li a{      padding: 22px 14px;      }      nav ul li a:hover{      height: 100%;      }        #header{      background: white;      position: fixed;      width: 100%;      top: 0;      z-index: 99;      }      }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <header>        <section id="header" class="container-fluid">          <div class="container">            <div class="header">                <div class="logo">logo</div>                <div class="menu_bar ">                <span class="hamburguer">                </span>              </div>                <nav id="mobilemenu">                <ul>                  <li><a>one</a></li>                  <li><a>two</a></li>                  <li><a>three</a></li>                  <li><a>four</a></li>                </ul>              </nav>              </div>          </div>        </section>   </header>

using twitter bootstrap , responsive classes, can done. there built-in dropdown in addition many classes showing/hiding elements on various screen sizes.


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