Question

我正在尝试使用以下JS代码开发一个访问我的网络摄像头的网页：

(function( $ ){

$.fn.html5_qrcode = function(qrcodeSuccess, qrcodeError, videoError) {
'use strict';

var height = this.height();
var width = this.width();

if (height == null) {
  height = 250;
}

if (width == null) {
  width = 300;
}

var vidTag = '<video id="html5_qrcode_video" width="' + width + 'px" height="' +   height   + 'px"></video>' 
var canvasTag = '<canvas id="qr-canvas" width="' + (width - 2) + 'px" height="' + (height - 2) + 'px" style="display:none;"></canvas>' 

this.append(vidTag);
this.append(canvasTag);



var video = $('#html5_qrcode_video').get(0);
var canvas;
var context; 
var localMediaStream;

$('#qr-canvas').each(function(index, element) {
  canvas = element;
  context = element.getContext('2d');   
});



var scan = function() {
  if (localMediaStream) {
    context.drawImage(video, 0, 0, 307,250);

    try {
      qrcode.decode();
    } catch(e) {
      qrcodeError(e);
    }

    setTimeout(scan, 500);

  } else {
    setTimeout(scan,500);
  }
}//end snapshot function

window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;
navigator.getUserMedia  = navigator.getUserMedia || navigator.webkitGetUserMedia ||      navigator.mozGetUserMedia || navigator.msGetUserMedia;

var successCallback = function(stream) {
    video.src = (window.URL && window.URL.createObjectURL(stream)) || stream;
    localMediaStream = stream;

    video.play();
    setTimeout(scan,1000);
}

// Call the getUserMedia method with our callback functions
if (navigator.getUserMedia) {
    navigator.getUserMedia({video: true}, successCallback, videoError);
} else {
    console.log('Native web camera streaming (getUserMedia) not supported in this  browser.');
    // Display a friendly "sorry" message to the user
}

qrcode.callback = qrcodeSuccess;

}; // end of html5_qrcode
})( jQuery );

我运行我的应用程序并且它可以工作，但在此之前凸轮打开，我有访问权限窗口，所以如果有任何解决方案允许我打开网络摄像头而不问，我会徘徊。

Answer 1

出于显而易见的原因，您无法在未经同意的情况下开启人物摄像头并开始录制。

在本地，您可以打开特定功能，而无需通过设置策略向某些供应商（如Chrome）询问。我在评论

中添加了链接的abit

如何允许自动访问网络摄像头

1 个答案: