fullscreenchange全屏事件监听，兼容chrome、safari

API参考：Fullscreen API 全屏显示网页

        ['fullscreenchange','webkitfullscreenchange','mozfullscreenchange'].forEach((item,index) => {
          window.addEventListener(item, () => this.fullscreenchange());
        })

   	//  监听全屏事件触发
      fullscreenchange() {
        let isFullScreen = document.fullScreen || document.mozFullScreen || document.webkitIsFullScreen;
        if (isFullScreen) {
          //  进入全屏
        } else {
          //  退出全屏
          
        }
      },