//全屏
(function (a, b) {
    "use strict";
    var c = function () {
        var a = [["requestFullscreen", "exitFullscreen", "fullscreenchange", "fullscreen", "fullscreenElement"], ["webkitRequestFullScreen", "webkitCancelFullScreen", "webkitfullscreenchange", "webkitIsFullScreen", "webkitCurrentFullScreenElement"], ["mozRequestFullScreen", "mozCancelFullScreen", "mozfullscreenchange", "mozFullScreen", "mozFullScreenElement"]];
        for (var c = 0,
        d = a.length; c < d; c++) {
            var e = a[c];
            if (e[1] in b) return e
        }
    } ();
    if (!c) return a.screenfull = !1;
    var d = "ALLOW_KEYBOARD_INPUT" in Element,
    e = {
        init: function () {  
            return b.addEventListener(c[2],
            function (a) {
                e.isFullscreen = b[c[3]],
                e.element = b[c[4]],
                e.onchange(a)
            }),
            this
        },
        isFullscreen: b[c[3]],
        element: b[c[4]],
        request: function (a) { 

            a = a || b.documentElement,
            a[c[0]](d && Element.ALLOW_KEYBOARD_INPUT),
            b.isFullscreen || a[c[0]]();
            //alert("dd");
        },
        exit: function () {
            b[c[1]]()
        },
        toggle: function (a) {
            this.isFullscreen ? this.exit() : this.request(a)
        },
        onchange: function () { }
    };
    a.screenfull = e.init()
})(window, document)