js 点击按钮显示全屏

 (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)

$("#doBoxTitleDateWeek").on('click',function () {
    screenfull && screenfull.request();
})