【CSS , jQuery】クリックでメニューアイコンが可変するスマホのメニューボタンとトグルメニュー

<header class="global-header" id="global-header">
	<h1><a href="#">ロゴ</a></h1>
	<p class="sp-btn" id="sp-btn">
		<span></span>
		<span></span>
		<span></span>
	</p>
	<nav id="global-nav">
		<ul>
			<li><a href="#">メニュー1</a></li>
			<li><a href="#">メニュー2</a></li>
			<li><a href="#">メニュー3</a></li>
			<li><a href="#">メニュー4</a></li>
			<li><a href="#">メニュー5</a></li>
		</ul>
	</nav>
</header>	

.global-header {
	overflow: hidden;
	position: relative;
	width: 100%;
	-moz-box-shadow: 0 0 1px 0 rgba(0, 0, 0, 0.4);
	-webkit-box-shadow: 0 0 1px 0 rgba(0, 0, 0, 0.4);
	box-shadow: 0 0 1px 0 rgba(0, 0, 0, 0.4);
	background: #fff;
}
.global-header h1 {
	display: block;
	height: 45px;
	margin: 0;
	padding: 16px 0 0 10px;
	-moz-box-sizing: border-box;
	-webkit-box-sizing: border-box;
	box-sizing: border-box;
	font-size: 14px;
	line-height: 1;
	vertical-align: top;
}
	
/* メニューボタン */
.global-header .sp-btn {
	position: absolute;
	top: 0;
	right: 0;
	display: block;
	width: 45px;
	height: 45px;
	cursor: pointer;
}
.global-header .sp-btn span {
	display: block;
	background: #414042;
	width: 20px;
	height: 2px;
	position: absolute;
	right: 12px;
	-moz-transition: all 0.3s ease-out;
	-o-transition: all 0.3s ease-out;
	-webkit-transition: all 0.3s ease-out;
	transition: all 0.3s ease-out;
}
.global-header .sp-btn span:first-child {
	top: 14px;
}
.global-header .sp-btn span:nth-child(2) {
	top: 21px;
}
.global-header .sp-btn span:last-child {
	bottom: 15px;
}
.global-header .sp-btn.on span:first-child {
	-moz-transform: translateY(6px) rotate(-45deg);
	-ms-transform: translateY(6px) rotate(-45deg);
	-webkit-transform: translateY(6px) rotate(-45deg);
	transform: translateY(6px) rotate(-45deg);
}
.global-header .sp-btn.on span:nth-child(2) {
	opacity: 0;
}
.global-header .sp-btn.on span:last-child {
	-moz-transform: translateY(-8px) rotate(45deg);
	-ms-transform: translateY(-8px) rotate(45deg);
	-webkit-transform: translateY(-8px) rotate(45deg);
	transform: translateY(-8px) rotate(45deg);
}
	
/* トグルメニュー */
.global-header nav {
	display: none;
}
.global-header ul {
	width: 100%;
	margin: 0;
	padding: 0;
	line-height: 1;
}
.global-header li {
	margin: 0;
	display: block;
	border-top: 1px solid #ccc;
	font-size: 14px;
}
.global-header li a {
	position: relative;
	display: block;
	padding: 12px 4.0625% 12px;
}
.global-header li a:before {
	display: block;
	content: "";
	position: absolute;
	-moz-transform: rotate(45deg);
	-ms-transform: rotate(45deg);
	-webkit-transform: rotate(45deg);
	transform: rotate(45deg);
	top: 50%;
	right: 3.75%;
	width: 10px;
	height: 10px;
	margin-top: -5px;
	background: #0C7CD5;
}
.global-header li a:after {
	display: block;
	content: "";
	position: absolute;
	-moz-transform: rotate(45deg);
	-ms-transform: rotate(45deg);
	-webkit-transform: rotate(45deg);
	transform: rotate(45deg);
	top: 50%;
	right: 4.375%;
	width: 10px;
	height: 10px;
	margin-top: -5px;
	background: #fff;
}

.global-header {
	overflow: hidden;
	position: relative;
	width: 100%;
	@include box-shadow(0 0 1px 0 rgba(0,0,0,0.4));
	background: #fff;
	h1 {
		display: block;
		height: 45px;
		margin: 0;
		@include box-sizing(border-box);
		font-size: 14px;
		line-height: 1;
		vertical-align: top;
	}
	.sp-btn {
		position: absolute;
		top: 0;
		right: 0;
		display: block;
		width: 45px;
		height:45px;
		cursor: pointer;
		span {
			display: block;
			background: #414042;
			width: 20px;
			height: 2px;
			position: absolute;
			right: 12px;
			@include transition(all ease-out 0.3s);
			&:first-child {
				top: 14px;
			}
			&:nth-child(2) {
				top: 21px;
			}
			&:last-child {
				bottom: 15px;
			}
		}
		&.on {
			span {
				&:first-child {
					@include transform(translateY(6px) rotate(-45deg));
				}
				&:nth-child(2) {
					opacity: 0;
				}
				&:last-child {
					@include transform(translateY(-8px) rotate(45deg));
				}
			}
		}
	}
	nav {
		display: none;
	}
	ul {
		width:100%;
		margin: 0;
		padding: 0;
		line-height: 1;
	}
	li {
		margin: 0;
		display: block;
		border-top: 1px solid #ccc;
		font-size: 14px;
		a {
			position: relative;
			display: block;
			padding: 12px 13px/320px*100% 12px;
			&:before{
				display: block;
				content: "";
				position: absolute;
				@include transform(rotate(45deg));
				top: 50%;
				right: 12px/320px*100%;
				width: 10px;
				height: 10px;
				margin-top: -5px;
				background: #0C7CD5;
			}
			&:after{
				display: block;
				content: "";
				position: absolute;
				@include transform(rotate(45deg));
				top: 50%;
				right: 14px/320px*100%;
				width: 10px;
				height: 10px;
				margin-top: -5px;
				background: #fff;
			}
		}
	}
}

//sp menu
$("#sp-btn").click(function(){
	$(this).toggleClass('on');
	$('#global-nav').slideToggle();
});
//PC SP切り替え時にスタイルリセット
var spW = 640; //ブレークポイント
$(window).resize(function(){
	var winWidth = window.innerWidth ? window.innerWidth: $(window).width();
	if(winWidth > spW && $('#global-nav').is(':hidden')) {
		$('#global-nav').removeAttr('style');
		$("#sp-btn").removeClass('on');
	}
});