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js调用摄像头拍照上传图片

作者:互联网

js调用摄像头拍照上传图片 imgTag </body>
点击查看代码
<!DOCTYPE html>
<html lang="en">
<head>
    <title>js调用摄像头拍照上传图片</title>
    <meta charset="utf-8">
</head>
<body>
<button onclick="openMedia()">开启摄像头</button>
<video id="video" width="500px" height="500px" autoplay="autoplay"></video>
<canvas id="canvas" width="500px" height="500px"></canvas>
<button onclick="takePhoto()">拍照</button>
<img id="imgTag" src="" alt="imgTag">
<button onclick="closeMedia()">关闭摄像头</button>

<script>
    let mediaStreamTrack=null; // 视频对象(全局)
    let video ;
    function openMedia() {
        let constraints = {
            video: { width: 500, height: 500 },
            audio: false
        };
        //获得video摄像头
         video = document.getElementById('video');     
        let promise = navigator.mediaDevices.getUserMedia(constraints);
        promise.then((mediaStream) => {
           // mediaStreamTrack = typeof mediaStream.stop === 'function' ? mediaStream : mediaStream.getTracks()[1];
           mediaStreamTrack=mediaStream.getVideoTracks()
            video.srcObject = mediaStream;
            video.play();
        });
    }

    // 拍照
    function takePhoto() {
        //获得Canvas对象
        let video = document.getElementById('video');
        let canvas = document.getElementById('canvas');
        let ctx = canvas.getContext('2d');
        ctx.drawImage(video, 0, 0, 500, 500);


        // toDataURL  ---  可传入'image/png'---默认, 'image/jpeg'
        let img = document.getElementById('canvas').toDataURL();
        // 这里的img就是得到的图片
        console.log('img-----', img);
        document.getElementById('imgTag').src=img;
//上传
      $.ajax({
        url:"/xxxx.do"
        ,type:"POST"
        ,data:{"imgData":img}
        ,success:function(data){
        console.log(data);
        document.gauges.forEach(function(gauge) {
        gauge.value =data.data
      });
      }
      ,error:function(){
        console.log("服务端异常!");
      }
      });


    }

    // 关闭摄像头
    function closeMedia() {
          let stream = document.getElementById('video').srcObject;
          let tracks = stream.getTracks();

          tracks.forEach(function(track) {
            track.stop();
          });

         document.getElementById('video').srcObject = null;
    }
</script>
</body>

标签:function,js,getElementById,video,let,document,上传,摄像头
来源: https://www.cnblogs.com/bigWebzzL/p/16511787.html