JS中全屏事件

<img src="./img/全屏.png" alt="" title="全屏" class="screen" />
            <img src="./img/退出全屏.png" alt="" title="退出全屏" class="exitscreen" style="display:none" />

.screen,
.exitscreen,
.renovate {
  width: 22px;
  height: 22px;
}

//绑定全屏事件
document.getElementsByClassName('screen')[0].addEventListener('click', fullScreen)
//取消全屏事件
document.getElementsByClassName('exitscreen')[0].addEventListener('click', fullExit)
//进入全屏
function fullScreen() {
  document.getElementsByClassName("exitscreen")[0].style.display = "block";
  document.getElementsByClassName("screen")[0].style.display = "none";
  var element = document.documentElement; //若要全屏页面中div，var element= document.getElementById("divID");  
  //IE 10及以下ActiveXObject 
  if (window.ActiveXObject) {
    var WsShell = new ActiveXObject('WScript.Shell')
    WsShell.SendKeys('{F11}');
  }
  //HTML W3C 提议  
  else if (element.requestFullScreen) {
    element.requestFullScreen();
  }
  //IE11  
  else if (element.msRequestFullscreen) {
    element.msRequestFullscreen();
  }
  // Webkit (works in Safari5.1 and Chrome 15)  
  else if (element.webkitRequestFullScreen) {
    element.webkitRequestFullScreen();
  }
  // Firefox (works in nightly)  
  else if (element.mozRequestFullScreen) {
    element.mozRequestFullScreen();
  }
}
//退出全屏  
function fullExit() {
  document.getElementsByClassName("exitscreen")[0].style.display = "none";
  document.getElementsByClassName("screen")[0].style.display = "block";
  var element = document.documentElement; //若要全屏页面中div，var element= document.getElementById("divID");   
  //IE ActiveXObject  
  if (window.ActiveXObject) {
    var WsShell = new ActiveXObject('WScript.Shell')
    WsShell.SendKeys('{F11}');
  }
  //HTML5 W3C 提议  
  else if (element.requestFullScreen) {
    document.exitFullscreen();
  }
  //IE 11  
  else if (element.msRequestFullscreen) {
    document.msExitFullscreen();
  }
  // Webkit (works in Safari5.1 and Chrome 15)  
  else if (element.webkitRequestFullScreen) {
    document.webkitCancelFullScreen();
  }
}