<header class="header">
		<div class="wrap">
			<h1 class="header_logo">tweenmaxDemo</h1>
			<div class="header_navButton" data-nav="close">
				<i class="lineCenter"></i>
			</div>
		</div>
	</header>
	<nav class="nav">
		<ul class="nav_list">
			<li><a href="">content1</a></li>
			<li><a href="">content2</a></li>
			<li><a href="">content3</a></li>
		</ul>
		<a href="" class="nav_close"></a>
	</nav>	

	<script type="text/javascript" src="http://satohmsys.info/files/demo/tweenmax/site/js/tweenmax/minified/TweenMax.min.js"></script>
@import url(https://fonts.googleapis.com/css?family=Pacifico);
body, html {
  padding: 0;
  margin: 0;
}

html {
  height: 100vh;
  position: relative;
  border-top: solid 5px #121212;
  line-height: 1.6;
}

img {
  line-height: 1;
  max-width: 100%;
  height: auto;
  outline: 0;
}

ul {
  margin: 0;
  padding: 0;
}

.header_logo, .mainVisual {
  font-family: 'Pacifico', cursive;
}

.wrap {
  max-width: 1100px;
  padding-left: 50px;
  padding-right: 50px;
  margin-left: auto;
  margin-right: auto;
}

@media screen and (max-width: 600px) {
  .wrap {
    padding-left: 1em;
    padding-right: 1em;
  }
}

.content {
  padding-top: 3em;
}

.header {
  background: #f9f9f9;
}
.header .wrap {
  height: 80px;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-align-content: center;
      -ms-flex-line-pack: center;
          align-content: center;
  -webkit-justify-content: space-between;
      -ms-flex-pack: justify;
          justify-content: space-between;
  -webkit-flex-wrap: wrap;
      -ms-flex-wrap: wrap;
          flex-wrap: wrap;
}
.header_logo {
  margin: 0;
}
.header_navButton {
  height: 50px;
  width: 50px;
  padding: 15px;
  box-sizing: border-box;
  position: relative;
  cursor: pointer;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-align-content: stretch;
      -ms-flex-line-pack: stretch;
          align-content: stretch;
  border-radius: 2px;
  background-color: #888;
}
.header_navButton:before, .header_navButton:after,
.header_navButton .lineCenter {
  content: " ";
  width: 60%;
  height: 3px;
  margin: auto;
  position: absolute;
  right: 0;
  left: 0;
  display: block;
  border-radius: 1px;
  background-color: #fff;
}
.header_navButton:before {
  top: 15px;
  left: 0;
}
.header_navButton:after {
  bottom: 15px;
  left: 0;
}
.header_navButton .lineCenter {
  top: 0;
  bottom: 0;
}
@media screen and (max-width: 600px) {
  .header {
    width: 100%;
    margin: auto;
    display: block;
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 5;
    border-top: solid 5px #121212;
  }
  .header_logo {
    margin-left: 1em;
    font-size: 5vw;
  }
  .header .wrap {
    height: 50px;
    padding-left: 0;
    padding-right: 0;
  }
  .header_navButton {
    right: 0;
    position: absolute;
  }
}

.nav {
  width: 100vw;
  height: 100vh;
  margin: 0;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 99;
  background-color: rgba(0, 0, 0, 0.9);
}
.nav, .nav_list, .nav_list li {
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-justify-content: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.nav {
  display: none;
}
.nav_list {
  width: 100vw;
  height: 30vw;
  -webkit-flex-direction: column;
      -ms-flex-direction: column;
          flex-direction: column;
}
.nav_list li {
  width: 100%;
  height: 33.3%;
  border-bottom: solid 1px rgba(255, 255, 255, 0.3);
  text-align: center;
  list-style: none;
}
.nav_list li:first-child {
  border-top: solid 1px rgba(255, 255, 255, 0.3);
}
.nav_list li a {
  font-size: 2.5vw;
  text-decoration: none;
  color: #fff;
}
.nav_list li a:hover {
  letter-spacing: 0.01em;
}
.nav_close {
  width: 40px;
  height: 40px;
  display: block;
  position: absolute;  
  right: 0;
  bottom: 10px;
}
.nav_close:before, .nav_close:after {
  margin: auto;
  display: block;
  position: absolute;
  right: 0;
  left: 0;
}
.nav_close:before, .nav_close:after {
  content: " ";
  width: 25px;
  height: 1px;
  -webkit-transform-origin: 50% 50%;
      -ms-transform-origin: 50% 50%;
          transform-origin: 50% 50%;
  background-color: #fff;
  transition: all 0.4s;
}
.nav_close:before {
  -webkit-transform: rotate(45deg);
      -ms-transform: rotate(45deg);
          transform: rotate(45deg);
}
.nav_close:after {
  -webkit-transform: rotate(-45deg);
      -ms-transform: rotate(-45deg);
          transform: rotate(-45deg);
}
.nav_close:hover:before {
  -webkit-transform: rotate(-45deg);
      -ms-transform: rotate(-45deg);
          transform: rotate(-45deg);
}
.nav_close:hover:after {
  -webkit-transform: rotate(45deg);
      -ms-transform: rotate(45deg);
          transform: rotate(45deg);
}
@media screen and (max-width: 600px) {
  .nav_list {
    height: 50vw;
  }
}
var getByClass = function( cls, num ){
	if( typeof num == "number" ){
		classCollection = document.getElementsByClassName( cls )[num];
	} else {
		classCollection = document.getElementsByClassName( cls );
		classCollection.length == 1 ? classCollection = classCollection[0] : '';

	}
	return classCollection;
};


$button = getByClass( 'header_navButton' ),
$nav = getByClass( 'nav' ),
$nav_close = getByClass( 'nav_close' ),
  $TimelineMax = new TimelineMax();

/**
* ナビ表示
*/
function Nav(){};
Nav.prototype.do = function(){
	this.status = $button.getAttribute( 'data-nav' );
	this.status == 'close' ? this.open() : this.close();
}
Nav.prototype.open = function(){
	$TimelineMax.fromTo( $nav, 0.5, {
		perspective: 200,
		scale: 0.95,
		transformOrigin: 'center center',
		rotationX: 75,
		opacity: 0,
		display: 'flex'
	},{
		scale: 1,
		rotationX: 0,
		opacity: 1,
		// lazy: true,
		onComplete: function(){
			document.body.style.overflow = 'hidden';
		}
	})
	$button.setAttribute( 'data-nav', 'open' );	
}
Nav.prototype.close = function(){
	$TimelineMax.to( $nav, 0.5, {
		scale: 0.95,
		rotationX: -75,
		z: 300,
		opacity: 0,
		display: 'none',
		onComplete: function(){
			document.body.style.overflow = 'visible';				
		}
	})
	$button.setAttribute( 'data-nav', 'close' );		
}
var Navigation = new Nav();

$nav.addEventListener( 'click', function( e ){
	e.stopPropagation();
	Navigation.do();
});
$button.addEventListener( 'click', function( e ){
	e.stopPropagation();
	Navigation.do();
});
$nav_close.addEventListener( 'click', function( e ){
	e.preventDefault()
	e.stopPropagation();
	Navigation.do();
});
Rerun