js 检测电脑设备是否已经安装了摄像头

╰半橙微兮° 2021-08-20 11:46 1324阅读 0赞

//检测电脑设备是否已经安装了摄像头
    	if (navigator.mediaDevices && navigator.mediaDevices.enumerateDevices) { 
    		// Firefox 38+ seems having support of enumerateDevicesx
    		navigator.enumerateDevices = function(callback) { 
    			navigator.mediaDevices.enumerateDevices().then(callback);
    		};
    	}
    	var MediaDevices = [];
    	var isHTTPs = location.protocol === 'https:';
    	var canEnumerate = false;
    
    	if (typeof MediaStreamTrack !== 'undefined' && 'getSources' in MediaStreamTrack) { 
    		canEnumerate = true;
    	} else if (navigator.mediaDevices && !!navigator.mediaDevices.enumerateDevices) { 
    		canEnumerate = true;
    	}
    
    	var hasMicrophone = false;
    	var hasSpeakers = false;
    	var hasWebcam = false;
    
    	var isMicrophoneAlreadyCaptured = false;
    	var isWebcamAlreadyCaptured = false;
    
    	function checkDeviceSupport(callback) { 
    		if (!canEnumerate) { 
    			return;
    		}
    
    		if (!navigator.enumerateDevices && window.MediaStreamTrack && window.MediaStreamTrack.getSources) { 
    			navigator.enumerateDevices = window.MediaStreamTrack.getSources.bind(window.MediaStreamTrack);
    		}
    
    		if (!navigator.enumerateDevices && navigator.enumerateDevices) { 
    			navigator.enumerateDevices = navigator.enumerateDevices.bind(navigator);
    		}
    
    		if (!navigator.enumerateDevices) { 
    			if (callback) { 
    				callback();
    			}
    			return;
    		}
    
    		MediaDevices = [];
    		navigator.enumerateDevices(function(devices) { 
    			devices.forEach(function(_device) { 
    				var device = { };
    				for (var d in _device) { 
    					device[d] = _device[d];
    				}
    
    				if (device.kind === 'audio') { 
    					device.kind = 'audioinput';
    				}
    
    				if (device.kind === 'video') { 
    					device.kind = 'videoinput';
    				}
    
    				var skip;
    				MediaDevices.forEach(function(d) { 
    					if (d.id === device.id && d.kind === device.kind) { 
    						skip = true;
    					}
    				});
    
    				if (skip) { 
    					return;
    				}
    
    				if (!device.deviceId) { 
    					device.deviceId = device.id;
    				}
    
    				if (!device.id) { 
    					device.id = device.deviceId;
    				}
    
    				if (!device.label) { 
    					device.label = 'Please invoke getUserMedia once.';
    					if (!isHTTPs) { 
    						device.label = 'HTTPs is required to get label of this ' + device.kind + ' device.';
    					}
    				} else { 
    					if (device.kind === 'videoinput' && !isWebcamAlreadyCaptured) { 
    						isWebcamAlreadyCaptured = true;
    					}
    
    					if (device.kind === 'audioinput' && !isMicrophoneAlreadyCaptured) { 
    						isMicrophoneAlreadyCaptured = true;
    					}
    				}
    
    				if (device.kind === 'audioinput') { 
    					hasMicrophone = true;
    				}
    
    				if (device.kind === 'audiooutput') { 
    					hasSpeakers = true;
    				}
    
    				if (device.kind === 'videoinput') { 
    					hasWebcam = true;
    				}
    
    				// there is no 'videoouput' in the spec.
    
    				MediaDevices.push(device);
    			});
    
    			if (callback) { 
    				callback();
    			}
    		});
    	}
    	//end
    
    checkDeviceSupport(function() { 
    if(hasWebcam == false){ 
    		console.log("没有摄像头！");
    		return false;
    	}else{ 
    		if(isWebcamAlreadyCaptured == false){ 
    			console.log("捕获摄像头失败，请重新安装摄像头！");
    			return false;
    		}
    	}
    	if(hasMicrophone == false){ 
    		console.log("没有麦克风！");
    		return false;
    	}else{ 
    		if(isMicrophoneAlreadyCaptured == false){ 
    			console.log("捕获麦克风失败，请重新安装麦克风！");
    			return false;
    		}
    	}
    });

**目前测试，谷歌浏览器个QQ浏览器可用**