vue 的项目中使用了 h5 的全屏 API，在使用esc键退出全屏时，默认调用“ document.exitFullScreen() ” 直接退出，想要做监听并设置业务，需要监听屏幕size变化来出发事件

mounted() {
    
    let that = this
    window.addEventListener('resize', function () {
       if (!that.isFullScreen()) {
         // 非全屏状态
         //业务逻辑
                
       }
    });
}

下面是全屏的完整代码

methods: {
  //全屏
    fullele() {
      return (
        document.fullscreenElement ||
        document.webkitFullscreenElement ||
        document.msFullscreenElement ||
        document.mozFullScreenElement ||
        null
      );
    },

    //判断是否全屏
    isFullScreen() {
      return !!(document.webkitIsFullScreen || this.fullele());
    },
    //退出全屏
    exitFullscreen() {
      this.fullScreenFlag = false;
      
      if (document.exitFullScreen) {
        document.exitFullScreen();
      } else if (document.mozCancelFullScreen) {
        document.mozCancelFullScreen();
      } else if (document.webkitExitFullscreen) {
        document.webkitExitFullscreen();
      } else if (document.msExitFullscreen) {
        document.msExitFullscreen();
      }
      
    },
    //全屏
    full(ele) {
      if (ele.requestFullscreen) {
        ele.requestFullscreen();
      } else if (ele.mozRequestFullScreen) {
        ele.mozRequestFullScreen();
      } else if (ele.webkitRequestFullscreen) {
        ele.webkitRequestFullscreen();
      } else if (ele.msRequestFullscreen) {
        ele.msRequestFullscreen();
      }
    },
    //切换是否全屏 全屏按钮要执行的方法
    toggleFullScreen() {
      if (this.isFullScreen()) {
        this.exitFullscreen();
      } else {
        this.fullScreenFlag = true;
        this.full(document.getElementById("dataMointor")); //要设置全屏的元素
        
      }
      
    }

}