Html网页开启全屏功能

JS代码段

function toggleFullScreen() {  
    if (!document.fullscreenElement && !document.mozFullScreenElement && !document.webkitFullscreenElement) {
        if (document.documentElement.requestFullscreen) {  
            document.documentElement.requestFullscreen();  
        } else if (document.documentElement.mozRequestFullScreen) {  
            document.documentElement.mozRequestFullScreen();  
        } else if (document.documentElement.webkitRequestFullscreen) {  
            document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);  
        }  
    }else {  
        if (document.cancelFullScreen) {  
            document.cancelFullScreen();  
        } else if (document.mozCancelFullScreen) {  
            document.mozCancelFullScreen();  
        } else if (document.webkitCancelFullScreen) {  
            document.webkitCancelFullScreen();  
        }  
    }  
}

HTML代码段

<input type='button' onclick='toggleFullScreen();'/>