利用浏览器全屏api实现js全屏

js:

(function () {
 var fullScreenApi = {
  supportsFullScreen : false,
  isFullScreen : function () {
   return false;
  },
  requestFullScreen : function () {},
  cancelFullScreen : function () {},
  fullScreenEventName : '',
  prefix : ''
 },
 browserPrefixes = 'webkit moz o ms khtml'.split(' ');
 // check for native support
 if (typeof document.cancelFullScreen != 'undefined') {
  fullScreenApi.supportsFullScreen = true;
 } else {
  // check for fullscreen support by vendor prefix
  for (var i = 0, il = browserPrefixes.length; i < il; i++) {
   fullScreenApi.prefix = browserPrefixes[i];
   if (typeof document[fullScreenApi.prefix + 'CancelFullScreen'] != 'undefined') {
    fullScreenApi.supportsFullScreen = true;
    break;
   }
  }
 }
 // update methods to do something useful
 if (fullScreenApi.supportsFullScreen) {
  fullScreenApi.fullScreenEventName = fullScreenApi.prefix + 'fullscreenchange';
  fullScreenApi.isFullScreen = function () {
   switch (this.prefix) {
   case '':
    return document.fullScreen;
   case 'webkit':
    return document.webkitIsFullScreen;
   default:
    return document[this.prefix + 'FullScreen'];
   }
  }
  fullScreenApi.requestFullScreen = function (el) {
   return (this.prefix === '') ? el.requestFullScreen() : el[this.prefix + 'RequestFullScreen']();
  }
  fullScreenApi.cancelFullScreen = function (el) {
   return (this.prefix === '') ? document.cancelFullScreen() : document[this.prefix + 'CancelFullScreen']();
  }
 }
 // jQuery plugin
 if (typeof jQuery != 'undefined') {
  jQuery.fn.requestFullScreen = function () {
   return this.each(function () {
    if (fullScreenApi.supportsFullScreen) {
     fullScreenApi.requestFullScreen(this);
    }
   });
  };
 }
 // export api
 window.fullScreenApi = fullScreenApi;
})();
$(function(){
 $("#fullScreenBtn").click(function(){
  $("#fullScreen").requestFullScreen();
 });

 if(window.top != self){
  $("#tip").text("iframe里面不能演示该功能！请点击右下角的全屏查看！").show();
 }
});
if (!fullScreenApi.supportsFullScreen) {
 alert("您的破浏览器不支持全屏API哦，请换高版本的chrome或者firebox！");
}

html:

<!DOCTYPE html>
<html>
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title>javascript启用全屏</title>

 <script id="jquery_183" type="text/javascript" class="library" src=jquery-1.8.3.min.js"></script>
 </head>
 <body>
  <button id="fullScreenBtn">点击我进入全屏模式</button>
  <div id="fullScreen" class="fullScreen">
    <h1>
     我是全屏区域的内容！
   </h1>
   <div id="tip" style="display:none;">

   </div>
  </div>
 </body>
</html>

css:

body{
background:#fff;
}
button{
 border:1px solid #ccc;
 cursor:pointer;
  display:block;
  margin:auto;
  position:relative;
  top:100px;
}
.fullScreen{
 padding-top:10%;
 text-align:center;
 background: none repeat scroll 0 0 #FFFFFF;
}
/* Mozilla proposal (dash) */
.fullScreen:full-screen {
    width:100%;
    height:100%;
}
/* W3C proposal (no dash) */
.fullScreen:fullscreen {
    width:100%;
    height:100%;
}
/* currently working vendor prefixes */
.fullScreen:-webkit-full-screen, .fullScreen:-moz-full-screen {
    width:100%;
    height:100%;
}
:-webkit-full-screen{
width:100%;
    height:100%;
}