js切换全屏代码,亲测可用

直接撸代码

/**
     * 全屏和退出全屏的方法
     * @param num 1代表全屏 2代表退出全屏
     * @returns {Promise}
     */
    function screenFun(num) {
        num = num || 1;
        num = num * 1;
        var docElm = document.documentElement;

        switch (num) {
            case 1:
                if (docElm.requestFullscreen) {
                    docElm.requestFullscreen();
                } else if (docElm.mozRequestFullScreen) {
                    docElm.mozRequestFullScreen();
                } else if (docElm.webkitRequestFullScreen) {
                    docElm.webkitRequestFullScreen();
                } else if (docElm.msRequestFullscreen) {
                    docElm.msRequestFullscreen();
                }
                break;
            case 2:
                if (document.exitFullscreen) {
                    document.exitFullscreen();
                } else if (document.mozCancelFullScreen) {
                    document.mozCancelFullScreen();
                } else if (document.webkitCancelFullScreen) {
                    document.webkitCancelFullScreen();
                } else if (document.msExitFullscreen) {
                    document.msExitFullscreen();
                }
                break;
        }

        return new Promise(function (res, rej) {
            res("返回值");
        });
    }