使用javascript访问设备摄像头 [英] Accessing device camera using javascript

问题描述

我想使用 javascript 访问我的设备摄像头.但是这段代码只能在 firefox 中工作，在桌面上也一样.我想在其他浏览器和移动设备上访问我的相机.

I want to access my device camera using javascript . But this code only works in firefox and that too on desktop . I want to access my camera on other browsers as well as mobile devices.

function start()
 {
  var video = document.getElementById('video'),
  vendorUrl = window.URL;
  navigator.mediaDevices.getUserMedia({
        video: true,
        audio: true
    })
.then(function(stream) {
  video.src = vendorUrl.createObjectURL(stream);
          video.play();
})
.catch(function(err) {
alert("no");
});

};

推荐答案

  (function() {
    'use strict';
    var video = document.querySelector('video')
      , canvas;

    
    function takeSnapshot() {
      var img = document.querySelector('img') || document.createElement('img');
      var context;
      var width = video.offsetWidth
        , height = video.offsetHeight;

      canvas = canvas || document.createElement('canvas');
      canvas.width = width;
      canvas.height = height;

      context = canvas.getContext('2d');
      context.drawImage(video, 0, 0, width, height);

      img.src = canvas.toDataURL('image/png');
      document.body.appendChild(img);
    }

    
    if (navigator.mediaDevices) {
      // access the web cam
      navigator.mediaDevices.getUserMedia({video: true})
     
        .then(function(stream) {
         
		  video.srcObject = stream
          video.addEventListener('click', takeSnapshot);
        })
      
        .catch(function(error) {
          document.body.textContent = 'Could not access the camera. Error: ' + error.name;
        });
    }
  })();

video, img {
      max-width:100%;
    }

<video autoplay></video>

复制到本地运行

希望对你有帮助

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