使Div全屏

    toggleFullscreen() {
      const isFullscreen = document.webkitIsFullScreen || document.fullscreen;
      const canvas = document.getElementById(this.videoId);
      if (isFullscreen) {
        const exitFunc =
          document.exitFullscreen || document.webkitExitFullscreen;
        exitFunc.call(document);
      } else {
        const element = this.$refs.vcontainer;
        const fullscreenFunc =
          element.requestFullscreen || element.webkitRequestFullScreen;
        fullscreenFunc.call(element);
      }
    }