html5 video标签全屏

<!doctype  html>
<html>
<head>
<meta charset="utf-8" />
<title>全屏问题</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<meta http-equiv="imagetoolbar" content="no"/>
<meta name="apple-mobile-web-app-capable" content="yes"/>
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<style type="text/css">
*{
    padding: 0px;
    margin: 0px;
}
 
body div.videobox{
    width: 400px;
    height: 320px;
    margin: 100px auto;
    background-color:#000;
}
 
body div.videobox video.video
{
width: 100%;
    height: 100%;
}
 
:-webkit-full-screen {
 
}
 
:-moz-full-screen {
 
}
 
:-ms-fullscreen {
   
}
 
:-o-fullscreen {
   
}
 
:full-screen { 
  
}
 
:fullscreen {
  
}
 
:-webkit-full-screen video {
  width: 100%;
  height: 100%;
}
:-moz-full-screen video{
    width: 100%;
    height: 100%;
}
    </style>
</head>
<body>
  
 
<div id="videobox">
      
    <video controls="controls" preload="preload" id="video" poster="poster.jpg">
      <source src="./movie.ogg" type="video/ogg" />
      <source src="./movie.mp4" type="video/mp4" />
      <source src="./movie.webm" type="video/webm" />
      <object data="./movie.mp4" width="100%" height="100%">
        <embed width="100%" height="100%" src="./movie.swf" />
      </object>
 
    </video>
    <button id="fullScreenBtn">全屏</button>
</div>
  
  
<script type="text/javascript">
  
//反射調用
var invokeFieldOrMethod = function(element, method) 
{
   var usablePrefixMethod;
   ["webkit", "moz", "ms", "o", ""].forEach(function(prefix) {
       if (usablePrefixMethod) return;
       if (prefix === "") {
           // 无前缀，方法首字母小写
           method = method.slice(0,1).toLowerCase() + method.slice(1);   
       }
       var typePrefixMethod = typeof element[prefix + method];
       if (typePrefixMethod + "" !== "undefined") {
           if (typePrefixMethod === "function") {
               usablePrefixMethod = element[prefix + method]();
           } else {
               usablePrefixMethod = element[prefix + method];
           }
       }
   });
    
       return usablePrefixMethod;
};
    
//進入全屏
 function launchFullscreen(element) 
   {
    //此方法不可以在異步任務中執行，否則火狐無法全屏
     if(element.requestFullscreen) {
       element.requestFullscreen();
     } else if(element.mozRequestFullScreen) {
       element.mozRequestFullScreen();
     } else if(element.msRequestFullscreen){ 
       element.msRequestFullscreen();  
     } else if(element.oRequestFullscreen){
        element.oRequestFullscreen();
    }
    else if(element.webkitRequestFullscreen)
     {
       element.webkitRequestFullScreen();
     }else{
      
        var docHtml  = document.documentElement;
        var docBody  = document.body;
        var videobox  = document.getElementById('videobox');
        var  cssText = 'width:100%;height:100%;overflow:hidden;';
        docHtml.style.cssText = cssText;
        docBody.style.cssText = cssText;
        videobox.style.cssText = cssText+';'+'margin:0px;padding:0px;';
        document.IsFullScreen = true;
 
      }
   }
//退出全屏
   function exitFullscreen()
   {
       if (document.exitFullscreen) {
         document.exitFullscreen();
       } else if (document.msExitFullscreen) {
         document.msExitFullscreen();
       } else if (document.mozCancelFullScreen) {
         document.mozCancelFullScreen();
       } else if(document.oRequestFullscreen){
            document.oCancelFullScreen();
        }else if (document.webkitExitFullscreen){
         document.webkitExitFullscreen();
       }else{
        var docHtml  = document.documentElement;
        var docBody  = document.body;
        var videobox  = document.getElementById('videobox');
        docHtml.style.cssText = "";
        docBody.style.cssText = "";
        videobox.style.cssText = "";
        document.IsFullScreen = false;
    }
  }
document.getElementById('fullScreenBtn').addEventListener('click',function(){
    launchFullscreen(document.getElementById('video')); 
    window.setTimeout(function exit(){
//檢查瀏覽器是否處於全屏
if(invokeFieldOrMethod(document,'FullScreen') || invokeFieldOrMethod(document,'IsFullScreen') || document.IsFullScreen)
{
exitFullscreen();
}
   },5*1000);
},false);
 
</script>
</body>
  
</html>