前言

诶？这有一个按钮(～￣▽￣)～，这是一个在html中实现的具有金属质感并且能镜面反射的按钮~

效果

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电脑效果

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手机效果

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说明

主要思路是使用 navigator.mediaDevices.getUserMedia()调用设备摄像头来实现镜面反射，css部分用到了filter属性，后期可以根据需要调整它的属性值，做出更多反射效果。有了思路，实现起来还是比较简单的。

需要注意的是window.navigator.mediaDevices.getUserMedia()只能在localhost或https下才能使用，否则会报错哦。

完整代码

index.html

<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
	<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
	<style>
		body {
		  background-color: rgb(86, 86, 86);
		}
		
		:root {
		  --transition: 0.1s;
		  --border-radius: 56px;
		}
		
		.button-wrap {
		  margin: calc(30vh - 50px) auto 0;
		  width: 300px;
		  height: 100px;
		  position: relative;
		  transition: transform var(--transition), box-shadow var(--transition);
		}
		
		.button-wrap.pressed {
		  transform: translateZ(0) scale(0.98);
		}
		
		.button {
		  width: 100%;
		  height: 100%;
		  overflow: hidden;
		  border-radius: var(--border-radius);
		  box-shadow:
		    0px 0px 10px rgba(0, 0, 0, 0.6),
		    0px 0px 20px rgba(0, 0, 0, 0.4),
		    0px 0px 40px rgba(0, 0, 0, 0.2),
		    inset 0 2px 2px rgba(255, 255, 255, 0.8),
		    inset 0 -2px 2px rgba(255, 255, 255, 0.8);
		  transform: translateZ(0);
		  cursor: pointer;
		}
		
		.button.pressed {
		  box-shadow:
		    0px 0px 5px rgba(0, 0, 0, 0.6),
		    0px 0px 10px rgba(0, 0, 0, 0.4),
		    0px 0px 20px rgba(0, 0, 0, 0.2),
		    inset 0 2px 2px rgba(255, 255, 255, 0.8),
		    inset 0 -2px 2px rgba(255, 255, 255, 0.8);
		}
		
		.text {
		  position: absolute;
		  left: 50%;
		  top: 50%;
		  transform: translate(-50%, -50%);
		  pointer-events: none;
		  color: rgba(0, 0, 0, 0.9);
		  font-size: 48px;
		  font-weight: bold;
		  text-shadow:
		    0px 2px 1px rgba(255, 255, 255, 0.3),
		    0px -2px 1px rgba(255, 255, 255, 0.3);
		}
		
		.text::selection {
		  background-color: transparent;
		}
		
		.button .button-reflection {
		  width: 100%;
		  height: 100%;
		  transform: scaleX(-1);
		  object-fit: cover;
		  opacity: 0.7;
		  filter: blur(2px) saturate(0.6) brightness(1.1);
		  object-position: 0 -100px;
		}
	</style>
</head>

<body>
	<div id="app">
		<div v-show="cameraOpened" :class="`button-wrap ${buttonPressed ? 'pressed' : ''}`">
			<div :class="`button ${buttonPressed ? 'pressed' : ''}`" @mousedown="setButtonPressed(true)"
				@mouseup="setButtonPressed(false)" @touchstart="setButtonPressed(true)" @touchend="setButtonPressed(false)">
				<video class="button-reflection" ref="reflectionRef" />
			</div>
			<div class="text">Button</div>
		</div>
	</div>
	<script>
		new Vue({
			el: '#app',
			data: {
				cameraOpened: false,
				buttonPressed: false
			},
			mounted() {
				const _this = this
				navigator.mediaDevices.getUserMedia({
					video: true,
					audio: false
				}).then((stream) => {
					const video = this.$refs.reflectionRef
					video.srcObject = stream;
					video.onloadedmetadata = () => {
						_this.cameraOpened = true
						video.play()
					}
				})
			},
			methods: {
				setButtonPressed(val) {
					this.buttonPressed = val
				}
			}
		})
	</script>
</body>

</html>