//退出全屏
            exitScreen() {
                console.log("嘀嘀嘀")
                let el = document;
                let cfs = el.cancelFullScreen || el.webkitCancelFullScreen || el.mozCancelFullScreen || el.exitFullScreen;
                //typeof cfs != "undefined" && cfs
                if (cfs) {
                    cfs.call(el);
                } else if (typeof window.ActiveXObject !== "undefined") {
                    //for IE，這里和fullScreen相同，模擬按下F11鍵退出全屏
                    let wscript = new ActiveXObject("WScript.Shell");
                    if (wscript != null) {
                        wscript.SendKeys("{F11}");
                    }
                }
            },
            //進入全屏
            handleFullScreen() {
                console.log("點擊")
                let element = document.documentElement;
                if (this.fullscreen) {
                    if (document.exitFullscreen) {
                        document.exitFullscreen();
                    } else if (document.webkitCancelFullScreen) {
                        document.webkitCancelFullScreen();
                    } else if (document.mozCancelFullScreen) {
                        document.mozCancelFullScreen();
                    } else if (document.msExitFullscreen) {
                        document.msExitFullscreen();
                    }
                } else {
                    if (element.requestFullscreen) {
                        element.requestFullscreen();
                    } else if (element.webkitRequestFullScreen) {
                        element.webkitRequestFullScreen();
                    } else if (element.mozRequestFullScreen) {
                        element.mozRequestFullScreen();
                    } else if (element.msRequestFullscreen) {
                        // IE11
                        element.msRequestFullscreen();
                    }
                }
                this.fullscreen = !this.fullscreen;
            }
        }

得通過事件去觸發(fā),比如進入全屏就從上一頁跳轉過來就調用,退出就返回時調用