一个按钮

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<!doctype html>
<html lang='en'>
<head>
  <meta charset='UTF-8'>
  <meta name='viewport'
    content='width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0'>
  <meta http-equiv='X-UA-Compatible' content='ie=edge'>
  <title>Document</title>
	<style>
		.hamburger {
			padding: 15px 15px;
			display: inline-block;
			cursor: pointer;
			transition-property: opacity, -webkit-filter;
			transition-property: opacity, filter;
			transition-property: opacity, filter, -webkit-filter;
			transition-duration: 0.15s;
			transition-timing-function: linear;
			font: inherit;
			color: inherit;
			text-transform: none;
			background-color: transparent;
			border: 0;
			margin: 0;
			overflow: visible; }
		.hamburger:hover {
			opacity: 0.7; }
		.hamburger-box {
			width: 30px;
			height: 24px;
			display: inline-block;
			position: relative; }
		.hamburger-inner {
			display: block;
			top: 50%;
			margin-top: -2px; }
		.hamburger-inner, .hamburger-inner::before, .hamburger-inner::after {
			width: 30px;
			height: 4px;
			background-color: #000;
			border-radius: 4px;
			position: absolute;
			transition-property: -webkit-transform;
			transition-property: transform;
			transition-property: transform, -webkit-transform;
			transition-duration: 0.15s;
			transition-timing-function: ease; }
		.hamburger-inner::before, .hamburger-inner::after {
			content: '';
			display: block; }
		.hamburger-inner::before {
			top: -10px; }
		.hamburger-inner::after {
			bottom: -10px; }

		.hamburger--squeeze .hamburger-inner {
			transition-duration: 0.1s;
			transition-timing-function: cubic-bezier(0.55, 0.055, 0.675, 0.19); }
		.hamburger--squeeze .hamburger-inner::before {
			transition: top 0.1s 0.14s ease, opacity 0.1s ease; }
		.hamburger--squeeze .hamburger-inner::after {
			transition: bottom 0.1s 0.14s ease, -webkit-transform 0.1s cubic-bezier(0.55, 0.055, 0.675, 0.19);
			transition: bottom 0.1s 0.14s ease, transform 0.1s cubic-bezier(0.55, 0.055, 0.675, 0.19);
			transition: bottom 0.1s 0.14s ease, transform 0.1s cubic-bezier(0.55, 0.055, 0.675, 0.19), -webkit-transform 0.1s cubic-bezier(0.55, 0.055, 0.675, 0.19); }

		.hamburger--squeeze.is-active .hamburger-inner {
			-webkit-transform: rotate(45deg);
			transform: rotate(45deg);
			transition-delay: 0.14s;
			transition-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1); }
		.hamburger--squeeze.is-active .hamburger-inner::before {
			top: 0;
			opacity: 0;
			transition: top 0.1s ease, opacity 0.1s 0.14s ease; }
		.hamburger--squeeze.is-active .hamburger-inner::after {
			bottom: 0;
			-webkit-transform: rotate(-90deg);
			transform: rotate(-90deg);
			transition: bottom 0.1s ease, -webkit-transform 0.1s 0.14s cubic-bezier(0.215, 0.61, 0.355, 1);
			transition: bottom 0.1s ease, transform 0.1s 0.14s cubic-bezier(0.215, 0.61, 0.355, 1);
			transition: bottom 0.1s ease, transform 0.1s 0.14s cubic-bezier(0.215, 0.61, 0.355, 1), -webkit-transform 0.1s 0.14s cubic-bezier(0.215, 0.61, 0.355, 1); }

	</style>
</head>
<body>
<div class='hamburger hamburger--squeeze'>
	<div class='hamburger-box'>
		<div class='hamburger-inner'></div>
	</div>
</div>
</body>
<script>
	document.getElementsByClassName('hamburger')[0].onclick = function () {
		this.classList.contains('is-active') ? this.classList.remove('is-active') : this.classList.add('is-active');
  }
</script>
</html>