webrtc,人脸拍照小功能

2019-11-14 09:36:38

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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>学习webrtc-chapter2:get user media</title> <style> video,canvas{ border:1px solid gray; width:400px; height:400px; border-radius:50%; } </style> </head> <body> <video autoplay></video> <canvas id="myCanvas"></canvas> <button id="capture">拍照</button> <script src="photobooth.js"></script> </body> </html><script> function hasUserMedia(){//判断是否支持调用设备api，因为浏览器不同所以判断方式不同哦 return !!(navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia); } if(hasUserMedia()){ //alert(navigator.mozGetUserMedia) navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia; var video=document.querySelector("video"); var canvas=document.querySelector("canvas"); var streaming = false; navigator.getUserMedia({ video:true,//开启视频 audio:false//先关闭音频，因为会有回响，以后两台电脑通信不会有响声 },function(stream){//将视频流交给video video.src=window.URL.createObjectURL(stream); streaming = true; },function(err){ console.log("capturing",err) }); document.querySelector("#capture").addEventListener("click",function(event){ if(streaming){ //alert(video.clientHeight) //canvas.width = video.clientWidth; //canvas.height= video.clientHeight; canvas.width = 800; canvas.height = 800; var context = canvas.getContext('2d'); context.drawImage(video,20,20) } }) }else{ alert("浏览器暂不支持") } </script>

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