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">请将证件完整置于取景框内</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 = 300,
      //   v_t_w = window.screen.width;
      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()

        // // 设置自动对焦
        // const track = stream.getVideoTracks()[0];
        // const capabilities = track.getCapabilities(); // Check whether focus distance is supported or not.
        // if (capabilities.focusMode.includes('continuous')) {
        //   if (settings.focusMode !== 'continuous') {
        //     settings.focusMode = 'continuous';
        //     track.applyConstraints({ advanced: [{ focusMode: 'continuous' }] });
        //   }
        // }

        // 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 },
              width:  200,
              height: 400,
              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: 15vh;
      /* border-radius: 50%; */
    }

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


    .buttonBox {
      display: flex;
      justify-content: space-around;
      margin-top: 35vh;

      .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>