ビデオスケーリングを調整します

    // 调整屏幕缩放
    adjustScreenZoom(){
        let iFullscreen = this.currentFullScreenStatus; //当前是否全屏状态
        let fullscreenEnabled = document.fullscreenEnabled ||
                                document.mozFullScreenEnabled ||
                                document.webkitFullscreenEnabled ||
                                document.msFullscreenEnabled;
        if (fullscreenEnabled) {
          let de = document.documentElement;
          if (iFullscreen) {
            //关闭全屏
            if (document.exitFullscreen) {
              document.exitFullscreen();
            } else if (document.mozCancelFullScreen) {
              document.mozCancelFullScreen();
            } else if (document.webkitCancelFullScreen) {
              document.webkitCancelFullScreen();
            }
          } else {
            //打开全屏
            if (de.requestFullscreen) {
              de.requestFullscreen();
            } else if (de.mozRequestFullScreen) {
              de.mozRequestFullScreen();
            } else if (de.webkitRequestFullScreen) {
              de.webkitRequestFullScreen();
            }
          }
        } 
        else {
          alert('浏览器当前不能全屏');
        }
      this.currentFullScreenStatus = !this.currentFullScreenStatus;
    }