chubiao
/
yl-gzh


			
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							<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>H5摄像头(新版浏览器https)(兼容老版浏览器)</title>
		<script type="text/javascript" src="https://js.cdn.aliyun.dcloud.net.cn/dev/uni-app/uni.webview.1.5.2.js">
		</script>
	</head>
	<body style="background-color: blanchedalmond;display: flex;flex-direction: column;">
		<!-- 说明：将网页更改为https访问才行 否者报错：NotSupportedError Only secure origins are allowed (see: https://goo.gl/Y0ZkNV). -->
		<!-- video用于显示媒体设备的视频流，自动播放；属性：https://zhuanlan.zhihu.com/p/535917105 -->
		<video id="video" autoplay webkit-playsinline="true" playsinline="true"></video>
		<!-- transform: rotateY(180deg); 镜像解决 -->
		<!-- 可以通过画布canvas渲染，获取使用默认的video也行 -->
		<!-- <canvas id="canvas" width="500" height="400" style="transform: rotateY(180deg);"></canvas> -->
		<div class="box">
			<canvas id="canvas"></canvas>
			<span class="text">请将身份证完整置于取景框内</span>

			<div class="buttonBox">
				<!-- 拍照按钮 -->
				<img class="buttonImg" id="back" src="../images/back.png" />
				<img class="buttonImg" id="capture" src="../images/pai.png" />
				<img class="buttonImg" id="fanzhuan" style="visibility: hidden" src="../images/fan.png" />
			</div>
		</div>

		<div id="popup">
			<img id="popupImg" alt="" src="">
			<div class="popupBox">
				<button id="closeBtn">取消</button>
				<button id="okBtn">确认</button>
			</div>
		</div>


		<script type="text/javascript">
			// 获取弹窗元素
			var popup = document.getElementById('popup');
			var popupImg = document.getElementById('popupImg');
			popup.style.display = 'none';
			// 获取关闭按钮元素
			var closeBtn = document.getElementById('closeBtn');
			var okBtn = document.getElementById('okBtn');

			var video = document.getElementById("video");
			var canvas = document.getElementById("canvas");
			var context = canvas.getContext("2d");
			var ratio = 1;
			var v_t_h = 200,
				v_t_w = window.screen.width;
			var mode = 'environment';
			var mediaStreamTrack;

			// canvas.width = v_t_w;
			// canvas.height = v_t_h;

			document.addEventListener('UniAppJSBridgeReady', function() {
				okBtn.addEventListener('click', function() {
					uni.postMessage({
						data: {
							base64: popupImg.src
						}
					});
					window.history.back(-1)
				});
			});


			// 弹出弹窗
			function openPopup() {
				popup.style.display = 'block';
			}
			// 关闭弹窗
			function closePopup() {
				takePhoto();
				popup.style.display = 'none';
			}
			// 绑定关闭按钮的点击事件
			closeBtn.addEventListener('click', closePopup);

			// 访问用户媒体设备的兼容方法
			function getUserMedia(constrains, successFun, errorFun) {
				//like12 modified,20210628,bug,navigator.mediaDevices为空会导致后面卡死
				if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
					//最新标准API(新版浏览器https)
					navigator.mediaDevices.getUserMedia(constrains).then(successFun).catch(errorFun);
				} else if (navigator.webkitGetUserMedia) {
					//like12 modified,20210628,不是这种调用方法 应该为后者
					//webkit内核浏览器(老版浏览器)
					//navigator.webkitGetUserMedia(constrains).then(successFun).catch(errorFun);
					navigator.webkitGetUserMedia({
						"video": true
					}, successFun, errorFun);
				} else if (navigator.mozGetUserMedia) {
					//Firefox浏览器
					navagator.mozGetUserMedia(constrains).then(successFun).catch(errorFun);
				} else if (navigator.getUserMedia) {
					//旧版API
					navigator.getUserMedia(constrains).then(successFun).catch(errorFun);
				}
			}

			// 成功的回调函数
			function successFun(stream) {
				//like12 modifed,20210618,Chrome升级后,新版本不再支持该用法
				//摄像头视频流显示报错Failed to execute 'createObjectURL' on 'URL'
				//研究即时通信的过程中需要调用摄像头，发现报错，原来是谷歌弃用了这个方法，根据官方提示修改即可
				//所以原先的代码：video.src = URL.createObjectURL(stream);
				//需要被修改为：video.srcObject = stream;
				//(新版浏览器https)

				if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
					video.srcObject = stream;
				}
				//(老版浏览器)
				else {
					//兼容webkit内核浏览器
					var CompatibleURL = window.URL || window.webkitURL;
					//将视频流设置为video元素的源
					//此处的代码将会报错  解决的办法是将video的srcObject属性指向stream即可
					video.src = CompatibleURL.createObjectURL(stream);
				}
				mediaStreamTrack = stream.getTracks()[0];
				let settings = mediaStreamTrack.getSettings()
				const {
					height,
					width
				} = settings
				ratio = width / height
				v_t_w  = v_t_h * ratio
				canvas.width = v_t_w;
				canvas.height = v_t_h;

				// 播放视频
				video.play();
				// 可以通过画布canvas渲染，获取使用默认的video也行
				setInterval(function() {
					context.drawImage(video, 0, 0, v_t_w, v_t_h);
					// context.beginPath();
					// context.arc(centerX, centerY, 70, 0, Math.PI * 2, false); // 绘制
					// context.stroke();
				}, 10);
			}

			// 异常的回调函数
			function errorFun(error) {
				console.log("访问用户媒体设备失败：", error.name, error.message);
				alert("访问用户媒体设备失败：" + error.name + " " + error.message);
			}

			document.getElementById('back').addEventListener('click', function() {
				window.history.back(-1)
			})
			document.getElementById('fanzhuan').addEventListener('click', function() {
				changeMode();
			})
			// 注册拍照按钮的单击事件-截图
			document.getElementById("capture").addEventListener("click", function() {
				mediaStreamTrack && mediaStreamTrack.stop();
				var base64Img = canvas.toDataURL('image/jpg');
				//var base64 = canvas.toDataURL('image/jpeg',0.5);// 图片质量0.5
				popupImg.src = base64Img;
				openPopup()
			});

			function takePhoto() {
				// 开始调用摄像头
				//like12 modified,20210628,bug,navigator.mediaDevices为空会导致后面卡死
				if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia ||
					navigator.getUserMedia ||
					navigator.webkitGetUserMedia ||
					navigator.mozGetUserMedia) {
					// 调用用户媒体设备，访问摄像头
					getUserMedia({
						video: {
							width: {
								min: 640
							},
							height: {
								min: 480
							},
							facingMode: mode //设置使用后置摄像头，user为前置摄像头
						},
					}, successFun, errorFun);
				} else {
					alert("你的浏览器不支持访问用户媒体设备");
				}
			}

			takePhoto();

			function changeMode() {
				console.log("翻转摄像头");
				mode = mode === 'user' ? 'environment' : 'user';
				mediaStreamTrack.stop();
				takePhoto();
			}
		</script>
	</body>
	<style>
		video {
			transform: rotateY(180deg);
			display: none;
		}

		.box {
			margin: 0 auto;
			display: flex;
			flex-direction: column;
			text-align: center;
			height: 98vh;
			width: 100%;

		}

		canvas {
			margin-top: 5vh;
			/* border-radius: 50%; */
		}

		.text {
			margin-top: 3vh;
			color: #888;
		}


		.buttonBox {
			display: flex;
			justify-content: space-around;
			margin-top: 15vh;

			.buttonImg {
				width: 15vw;
				object-fit: contain;
			}
		}

		.noneImg {
			display: none;
		}

		#popup {
			position: fixed;
			top: 30%;
			left: 50%;
			transform: translate(-50%, -50%);
			background: #fff;
			padding: 20px;
			border-radius: 5px;
			box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
			z-index: 9999;
		}

		#popup h2 {
			margin-top: 0;
		}

		#closeBtn {
			width: 30vw;
			height: 4vh;
			border-radius: 16px;
		}

		#okBtn {
			width: 30vw;
			height: 4vh;
			border-radius: 16px;
		}

		.popupBox {
			margin-top: 2vh;
			width: 100%;
			display: flex;
			justify-content: space-around;
		}
	</style>
</html>