PC頁面全屏顯示以及退出全屏顯示

//點擊，進入全屏
$('#btn4').click(()=>{
      let el = document.documentElement;
      let rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen; 
      if(typeof rfs != 'undefined' && rfs){
        rfs.call(el)
      }else if(typeof window.ActiveXObject != 'undefined'){
        let wscript = new ActiveXObject('WScript.Shell');
        if(wscript != null){
          wscript.SendKeys('{F11}')
        }
      }
    })

//點擊，退出全屏
    $('#btn5').click(()=>{
      let exitFn = document.exitFullscreen || document.mozCancelFullScreen || document.webkitExitFullScreen || document.webkitCancelFullScreen;
      if(exitFn){
        exitFn.call(document);
      }else if(typeof window.ActiveXObject != 'undefined'){
        let wscript = new ActiveXObject('WScript.Shell');
        if(wscript != null){
          wscript.SendKeys('{F11}');
        }
      }
    })