全屏模式

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>desktop</title>
</head>
<body id="content">
<b onclick="fullscreen()">全屏</b>
</body>

<script type="text/javascript" charset="utf-8">
    function fullscreen(){
        if (document.fullscreenElement ||
                document.mozFullScreenElement ||
                document.webkitFullscreenElement ||
                document.msFullscreenElement) {
            if (document.exitFullscreen) {
                document.exitFullscreen();
            } else if (document.mozCancelFullScreen) {
                document.mozCancelFullScreen();
            } else if (document.webkitExitFullscreen) {
                document.webkitExitFullscreen();
            } else if (document.msExitFullscreen) {
                document.msExitFullscreen();
            }
        } else {
            if (document.documentElement.requestFullscreen) {
                document.documentElement.requestFullscreen();
            } else if (document.documentElement.mozRequestFullScreen) {
                document.documentElement.mozRequestFullScreen();
            } else if (document.documentElement.webkitRequestFullscreen) {
                document.documentElement.webkitRequestFullscreen();
            } else if (document.documentElement.body.msRequestFullscreen) {
                document.documentElement.body.msRequestFullscreen();
            }
        }
    }
</script>
</html>

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