js 开启video全屏模式

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

            　　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}"); 
                        } 
                    } 

                }