ie9及以下版本显示滑出侧边栏菜单时的问题

我创建了一个100%宽度和高度的侧边栏菜单，当您单击菜单按钮时显示。一切都很好，直到它达到ie9或以下。实际情况是，菜单已经覆盖了整个网站，而不是按下菜单滑出菜单。

如何在ie9中正确运行?

这是我的JS，这是完整的功能http://jsfiddle.net/pc89G/8/

 $(document).ready(function () {
    var $frm = $('#menu').hide();
var $bts = $("#menu-trigger").on('click', function () {
var $this = $(this)
    $bts.filter(".selected").not(this).removeClass('selected');
    $this.toggleClass('selected');
if ($this.hasClass('selected') && $frm.is(':visible')) {
    $frm.stop(true, true).slideUp(function () {
    $(this).slideDown()
});
    } else {
    $frm.stop(true, true).slideToggle();
    }
});
    $bts.filter('.selected').click();
$("#content, a.gn-icon-menu").click(function () {
    $bts.filter(".selected").removeClass('selected');
    $frm.slideUp();
});
    $bts.filter('.selected').hover();
    $("a.gn-icon-menu").hover(function () {
    $bts.filter(".selected").removeClass('selected');
    $frm.slideUp();
});
 });
 ;( function( window ) {
'use strict';
 function mobilecheck() {
var check = false;
(function(a)     {if(/(android|ipad|playbook|silk|bb'd+|meego).+mobile|avantgo|bada'/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)'/|plucker|pocket|psp|series(4|6)0|symbian|treo|up'.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s'-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|'-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw'-(n|u)|c55'/|capi|ccwa|cdm'-|cell|chtm|cldc|cmd'-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc'-s|devi|dica|dmob|do(c|p)o|ds(12|'-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly('-|_)|g1 u|g560|gene|gf'-5|g'-mo|go('.w|od)|gr(ad|un)|haie|hcit|hd'-(m|p|t)|hei'-|hi(pt|ta)|hp( i|ip)|hs'-c|ht(c('-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i'-(20|go|ma)|i230|iac( |'-|'/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |'/)|klon|kpt |kwc'-|kyo(c|k)|le(no|xi)|lg( g|'/(k|l|u)|50|54|'-[a-w])|libw|lynx|m1'-w|m3ga|m50'/|ma(te|ui|xo)|mc(01|21|ca)|m'-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t('-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)'-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|'-([1-8]|c))|phil|pire|pl(ay|uc)|pn'-2|po(ck|rt|se)|prox|psio|pt'-g|qa'-a|qc(07|12|21|32|60|'-[2-7]|i'-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55'/|sa(ge|ma|mm|ms|ny|va)|sc(01|h'-|oo|p'-)|sdk'/|se(c('-|0|1)|47|mc|nd|ri)|sgh'-|shar|sie('-|m)|sk'-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h'-|v'-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl'-|tdg'-|tel(i|m)|tim'-|t'-mo|to(pl|sh)|ts(70|m'-|m3|m5)|tx'-9|up('.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|'-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c('-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas'-|your|zeto|zte'-/i.test(a.substr(0,4)))check = true})(navigator.userAgent||navigator.vendor||window.opera);
    return check;
}
function gnMenu( el, options ) {    
    this.el = el;
    this._init();
}
gnMenu.prototype = {
    _init : function() {
        this.trigger = this.el.querySelector( 'a.gn-icon-menu' );
        this.menu = this.el.querySelector( 'nav.navMenu-wrapper' );
        this.isMenuOpen = false;
        this.eventtype = mobilecheck() ? 'touchstart' : 'click';
        this._initEvents();
        var self = this;
        this.bodyClickFn = function() {
            self._closeMenu();
            this.removeEventListener( self.eventtype, self.bodyClickFn );
        };
    },
    _initEvents : function() {
        var self = this;
        if( !mobilecheck() ) {
            this.trigger.addEventListener( 'click', function(ev) { self._openIconMenu(); } );
            this.trigger.addEventListener( 'click', function(ev) { self._closeIconMenu(); } );
            this.menu.addEventListener( 'click', function(ev) {
                self._openMenu(); 
                document.addEventListener( self.eventtype, self.bodyClickFn ); 
            } );
        }
        this.trigger.addEventListener( this.eventtype, function( ev ) {
            ev.stopPropagation();
            ev.preventDefault();
            if( self.isMenuOpen ) {
                self._closeMenu();
                document.removeEventListener( self.eventtype, self.bodyClickFn );
            }
            else {
                self._openMenu();
                document.addEventListener( self.eventtype, self.bodyClickFn );
            }
        } );
        this.menu.addEventListener( this.eventtype, function(ev) { ev.stopPropagation(); } );
    },
    _openIconMenu : function() {
        classie.add( this.menu, 'gn-open-part' );
    },
    _closeIconMenu : function() {
        classie.remove( this.menu, 'gn-open-part' );
    },
    _openMenu : function() {
        if( this.isMenuOpen ) return;
        classie.add( this.trigger, 'gn-selected' );
        this.isMenuOpen = true;
        classie.add( this.menu, 'gn-open-all' );
        this._closeIconMenu();
    },
    _closeMenu : function() {
        if( !this.isMenuOpen ) return;
        classie.remove( this.trigger, 'gn-selected' );
        this.isMenuOpen = false;
        classie.remove( this.menu, 'gn-open-all' );
        this._closeIconMenu();
    }
}
// add to global namespace
window.gnMenu = gnMenu;
 } )( window );
  new gnMenu( document.getElementById( 'navMenu' ) );   
 ( function( window ) {
      'use strict';
  function classReg( className ) {
        return new RegExp("(^|''s+)" + className + "(''s+|$)");
 }
  var hasClass, addClass, removeClass;
  if ( 'classList' in document.documentElement ) {
        hasClass = function( elem, c ) {
        return elem.classList.contains( c );
 };
  addClass = function( elem, c ) {
  elem.classList.add( c );
 };
  removeClass = function( elem, c ) {
        elem.classList.remove( c );
      };
 }
  else {
  hasClass = function( elem, c ) {
  return classReg( c ).test( elem.className );
 };
  addClass = function( elem, c ) {
  if ( !hasClass( elem, c ) ) {
  elem.className = elem.className + ' ' + c;
 }
 };
  removeClass = function( elem, c ) {
  elem.className = elem.className.replace( classReg( c ), ' ' );
 };
 }
  function toggleClass( elem, c ) {
   var fn = hasClass( elem, c ) ? removeClass : addClass;
   fn( elem, c );
 }
  var classie = {
   // full names
   hasClass: hasClass,
   addClass: addClass,
   removeClass: removeClass,
   toggleClass: toggleClass,
   // short names
   has: hasClass,
   add: addClass,
   remove: removeClass,
   toggle: toggleClass
 };
 // transport
  if ( typeof define === 'function' && define.amd ) {
        // AMD
   define( classie );
      } else {
   // browser global
  window.classie = classie;
 }
 })( window );