<video        id="webcam"        :style="videoStyle"        :width="videoWidth"        :height="videoHeight"        loop        preload      >      </video>

 initVideo() {      let that = this;      this.video = document.getElementById("webcam");      setTimeout(() => {        if (          navigator.mediaDevices.getUserMedia ||          navigator.getUserMedia ||          navigator.webkitGetUserMedia ||          navigator.mozGetUserMedia        ) {          //調用用戶媒體設備, 訪問攝像頭          this.getUserMedia(            {              video: {                width: {                  ideal: that.videoWidth,                  max: that.videoWidth                },                height: {                  ideal: that.videoHeight,                  max: that.videoHeight                },                facingMode: "user",    //前置攝像頭                frameRate: {                  ideal: 30,                  min: 10                }              }            },            this.videoSuccess,            this.videoError          );        } else {          this.$toast.center("攝像頭打開失敗,請檢查權限設置!");        }      }, 300);    },     getUserMedia(constraints, success, error) {      if (navigator.mediaDevices.getUserMedia) {        //最新的標準API        navigator.mediaDevices          .getUserMedia(constraints)          .then(success)          .catch(error);      } else if (navigator.webkitGetUserMedia) {        //webkit核心瀏覽器        navigator.webkitGetUserMedia(constraints, success, error);      } else if (navigator.mozGetUserMedia) {        //firfox瀏覽器        navigator.mozGetUserMedia(constraints, success, error);      } else if (navigator.getUserMedia) {        //舊版API        navigator.getUserMedia(constraints, success, error);      }    },    videoSuccess(stream) {      this.mediaStreamTrack = stream;      this.video.srcObject = stream;      this.video.play();    },    videoError(error) {      console.error(error);      this.$toast.center("攝像頭打開失敗,請檢查權限設置!");    },

 this.canvas = document.createElement("canvas");  .... let context = this.canvas.getContext("2d"); context.drawImage(this.video, 0, 0, this.videoWidth, this.videoHeight); this.imgSrc = this.canvas.toDataURL("image/png");

        let that = this;        let base64Data = this.canvas.toDataURL();        let blob = this.dataURItoBlob(base64Data);           //        var file = new FormData();        file.append("file", blob);        file.append("key", that.uuid);        util.ajax          .post("XXXXXXXXXX", file, {            headers: {              "Content-Type": "multipart/form-data"            }          })          .then(function(response) {            if ((response.status = 200)) {                .....識別成功，顯示結果            } else {                ......識別失敗            }          })          .catch(function(error) {            console.error(error);          });              //base64轉換為Blob    dataURItoBlob(base64Data) {      var byteString;      if (base64Data.split(",")[0].indexOf("base64") >= 0)        byteString = atob(base64Data.split(",")[1]);      else byteString = unescape(base64Data.split(",")[1]);      var mimeString = base64Data        .split(",")[0]        .split(":")[1]        .split(";")[0];      var ia = new Uint8Array(byteString.length);      for (var i = 0; i < byteString.length; i++) {        ia[i] = byteString.charCodeAt(i);      }      return new Blob([ia], { type: mimeString });    },

myWebView.setWebChromeClient(new WebChromeClient() {         @TargetApi(Build.VERSION_CODES.LOLLIPOP)         @Override         public void onPermissionRequest(final PermissionRequest request) {                   request.grant(request.getResources());        }});