js全屏切换

html

<button onclick="toggleFullScreen(event)">点我全屏</button>

js

function FullScreen(el) {
    var isFullscreen = document.fullScreen || document.mozFullScreen || document.webkitIsFullScreen;
    if (!isFullscreen) { 
        (el.requestFullscreen && el.requestFullscreen()) ||
        (el.mozRequestFullScreen && el.mozRequestFullScreen()) ||
        (el.webkitRequestFullscreen && el.webkitRequestFullscreen()) || (el.msRequestFullscreen && el.msRequestFullscreen());

    } else { 
        document.exitFullscreen ? document.exitFullscreen() :
            document.mozCancelFullScreen ? document.mozCancelFullScreen() :
            document.webkitExitFullscreen ? document.webkitExitFullscreen() : '';
    }
}

function toggleFullScreen(e) {
    var el = e.srcElement || e.target; //target兼容Firefox
    el.innerHTML == '点我全屏' ? el.innerHTML = '退出全屏' : el.innerHTML = '点我全屏';
    FullScreen(el);
}