摄像头 | 开发笔记

# 摄像头

主要使用：

navigator.mediaDevices.getUserMedia
getVideoTracks

# 效果

# 代码

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

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>摄像头</title>
</head>

<body>
  <h2>摄像头</h2>
  <video id="video" src="" autoplay style="width: 500px; height: 300px; background-color: #000000;"></video>
  <br>
  <button onclick="useCamera()">调用摄像头</button>

  <script>
    const videoElm = document.getElementById('video');
    console.log(videoElm);
    function useCamera() {
      if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
        navigator.mediaDevices.getUserMedia({ video: true })
          .then((stream) => {
            console.log(stream);
            const videoTracks = stream.getVideoTracks();
            console.log(videoTracks);
            videoElm.srcObject = stream;
          })
          .catch((err) => {
            const tip = '摄像头授权失败！';
            alert(tip);
            throw Error(tip);
          });
      } else {
        alert('摄像头已禁用，或浏览器不支持此功能，请到浏览器设置中查看。');
        throw Error('浏览器不支持此功能！');
      }
    }
  </script>
</body>

</html>

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