Нужно написать условие

!function ($) {
 
  "use strict"; // jshint ;_;
 
 
 /* COLLAPSE PUBLIC CLASS DEFINITION
  * ================================ */
 
  var Collapse = function (element, options) {
    this.$element = $(element)
    this.options = $.extend({}, $.fn.collapse.defaults, options)
 
    if (this.options.parent) {
      this.$parent = $(this.options.parent)
    }
 
    this.options.toggle && this.toggle()
  }
 
  Collapse.prototype = {
 
    constructor: Collapse
 
  , dimension: function () {
      var hasWidth = this.$element.hasClass('width')
      return hasWidth ? 'width' : 'height'
    }
 
  , show: function () {
      var dimension
        , scroll
        , actives
        , hasData
 
      if (this.transitioning || this.$element.hasClass('in')) return
 
      dimension = this.dimension()
      scroll = $.camelCase(['scroll', dimension].join('-'))
      actives = this.$parent && this.$parent.find('> .accordion-group > .in')
 
      if (actives && actives.length) {
        hasData = actives.data('collapse')
        if (hasData && hasData.transitioning) return
        actives.collapse('hide')
        hasData || actives.data('collapse', null)
      }
 
      this.$element[dimension](0)
      this.transition('addClass', $.Event('show'), 'shown')
      $.support.transition && this.$element[dimension](this.$element[0][scroll])
    }
 
  , hide: function () {
      var dimension
      if (this.transitioning || !this.$element.hasClass('in')) return
      dimension = this.dimension()
      this.reset(this.$element[dimension]())
      this.transition('removeClass', $.Event('hide'), 'hidden')
      this.$element[dimension](0)
    }
 
  , reset: function (size) {
      var dimension = this.dimension()
 
      this.$element
        .removeClass('collapse')
        [dimension](size || 'auto')
        [0].offsetWidth
 
      this.$element[size !== null ? 'addClass' : 'removeClass']('collapse')
 
      return this
    }
 
  , transition: function (method, startEvent, completeEvent) {
      var that = this
        , complete = function () {
            if (startEvent.type == 'show') that.reset()
            that.transitioning = 0
            that.$element.trigger(completeEvent)
          }
 
      this.$element.trigger(startEvent)
 
      if (startEvent.isDefaultPrevented()) return
 
      this.transitioning = 1
 
      this.$element[method]('in')
 
      $.support.transition && this.$element.hasClass('collapse') ?
        this.$element.one($.support.transition.end, complete) :
        complete()
    }
 
  , toggle: function () {
      this[this.$element.hasClass('in') ? 'hide' : 'show']()
    }
 
  }
 
 
 /* COLLAPSE PLUGIN DEFINITION
  * ========================== */
 
  var old = $.fn.collapse
 
  $.fn.collapse = function (option) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('collapse')
        , options = $.extend({}, $.fn.collapse.defaults, $this.data(), typeof option == 'object' && option)
      if (!data) $this.data('collapse', (data = new Collapse(this, options)))
      if (typeof option == 'string') data[option]()
    })
  }
 
  $.fn.collapse.defaults = {
    toggle: true
  }
 
  $.fn.collapse.Constructor = Collapse
 
 
 /* COLLAPSE NO CONFLICT
  * ==================== */
 
  $.fn.collapse.noConflict = function () {
    $.fn.collapse = old
    return this
  }
 
 
 /* COLLAPSE DATA-API
  * ================= */
 
  $(document).on('click.collapse.data-api', '[data-toggle=collapse]', function (e) {
    var $this = $(this), href
      , target = $this.attr('data-target')
        || e.preventDefault()
        || (href = $this.attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '') //strip for ie7
      , option = $(target).data('collapse') ? 'toggle' : $this.data()
    $this[$(target).hasClass('in') ? 'addClass' : 'removeClass']('collapsed')
    $(target).collapse(option)
  })
 
}(window.jQuery);/*

<script type="text/javascript">
$(document).ready(function(){
    if ($(window).width() < 940) {
   *тут действие*
}
})
</script>