js 开启video全屏模式

方法一：

                function launchFullScreen() {
                    var element = document.documentElement;
                    if(element.requestFullScreen) {
                        element.requestFullScreen();
                    } else if(element.mozRequestFullScreen) {
                        element.mozRequestFullScreen();
                    } else if(element.webkitRequestFullScreen) {
                        element.webkitRequestFullScreen();
                    }
                }

方法二：

            　　function fullScreen() {
                    var el = document.documentElement;
                    var rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen;
                    if (typeof rfs != "undefined" && rfs) {
                        rfs.call(el);
                    } else if (typeof window.ActiveXObject != "undefined") {
                        // for Internet Explorer
                        var wscript = new ActiveXObject("WScript.Shell");
                        if (wscript != null) {
                            wscript.SendKeys("{F11}");
                        }
                    } 

                }