Detailed explanation of JavaScript full screen and exit full screen implementation methods

This article mainly introduces JavaScript full screen and exit full screen events. First, use window.ieIsfSceen = false or true to determine whether it is full screen. After entering full screen and exiting full screen, friends who need it can refer to it

The code is as follows:

window.isflsgrn = false;//ie11以下是否进入全屏标志，true为全屏状态，false为非全屏状态
      window.ieIsfSceen = false;//ie11是否进入全屏标志，true为全屏状态，false为非全屏状态
      //跨浏览器返回当前 document 是否进入了可以请求全屏模式的状态
      function fullscreenEnable(){
        var isFullscreen = document.fullscreenEnabled ||
        window.fullScreen ||
        document.mozFullscreenEnabled ||
        document.webkitIsFullScreen;
        return isFullscreen;
      }
      //全屏
      var fScreen = function(){
        var docElm = document.documentElement;
        if (docElm.requestFullscreen) {
          docElm.requestFullscreen();
        }
        else if (docElm.msRequestFullscreen) {
          docElm.msRequestFullscreen();
          ieIsfSceen = true;
        }
        else if (docElm.mozRequestFullScreen) {
          docElm.mozRequestFullScreen();
        }
        else if (docElm.webkitRequestFullScreen) {
          docElm.webkitRequestFullScreen();
        }else {//对不支持全屏API浏览器的处理，隐藏不需要显示的元素
          window.parent.hideTopBottom();
          isflsgrn = true;
          $("#fsbutton").text("退出全屏");
        }
      }
      //退出全屏
      var cfScreen = function(){
        if (document.exitFullscreen) {
          document.exitFullscreen();
        }
        else if (document.msExitFullscreen) {
          document.msExitFullscreen();
        }
        else if (document.mozCancelFullScreen) {
          document.mozCancelFullScreen();
        }
        else if (document.webkitCancelFullScreen) {
          document.webkitCancelFullScreen();
        }else {
          window.parent.showTopBottom();
          isflsgrn = false;
          $("#fsbutton").text("全屏");
        }
      }
      //全屏按钮点击事件
      $("#fsbutton").click(function(){
        var isfScreen = fullscreenEnable();
        if(!isfScreen && isflsgrn == false){
          if (ieIsfSceen == true) {
            document.msExitFullscreen();
            ieIsfSceen = false;
            return;
          }
          fScreen();
        }else{
          cfScreen();
        }
      })
      //键盘操作
      $(document).keydown(function (event) {
        if(event.keyCode == 27 && ieIsfSceen == true){
          ieIsfSceen = false;
        }
      });
      //监听状态变化
      if (window.addEventListener) {
        document.addEventListener('fullscreenchange', function(){ 
          if($("#fsbutton").text() == "全屏"){
            $("#fsbutton").text("退出全屏"); 
          }else{
            $("#fsbutton").text("全屏");
          }
        });
        document.addEventListener('webkitfullscreenchange', function(){ 
          if($("#fsbutton").text() == "全屏"){
            $("#fsbutton").text("退出全屏"); 
          }else{
            $("#fsbutton").text("全屏");
          }
        });
        document.addEventListener('mozfullscreenchange', function(){ 
          if($("#fsbutton").text() == "全屏"){
            $("#fsbutton").text("退出全屏"); 
          }else{
            $("#fsbutton").text("全屏");
          }
        });
        document.addEventListener('MSFullscreenChange', function(){ 
          if($("#fsbutton").text() == "全屏"){
            $("#fsbutton").text("退出全屏"); 
          }else{
            $("#fsbutton").text("全屏");
          }
        });
      }

It is worth noting the fullscreenEnabled parameter. There are different opinions on the Internet. Some say it monitors whether the browser has entered the full-screen mode and can request it. Status, some say it is just a flag to determine whether the browser supports full screen. Problems do occur in actual use. IE11 cannot recognize this attribute. You need to set a separate mark to control whether IE11 is currently in full screen status.

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