问当悬停菜单( Jquery )时如何更改.body的背景色？

EN

$(function(){
 $('.dc-mega').hover(function(){$('html').css('background-color','#676767') } );
});

//define the defaults for the plugin and how to call it 
$.fn.dcMegaMenu = function(options){
    //set default options  
    var defaults = {
        classParent: 'dc-mega',
        classContainer: 'sub-container',
        classSubParent: 'mega-hdr',
        classSubLink: 'mega-hdr',
        classWidget: 'dc-extra',
        rowItems: 5,
        speed: 'fast',
        effect: 'fade',
        event: 'hover',
        fullWidth: false,
        onLoad : function(){},
        beforeOpen : function(){},
        beforeClose: function(){}
    };

    //call in the default otions
    var options = $.extend(defaults, options);
    var $dcMegaMenuObj = this;

    //act upon the element that is passed into the design    
    return $dcMegaMenuObj.each(function(options){

        var clSubParent = defaults.classSubParent;
        var clSubLink = defaults.classSubLink;
        var clParent = defaults.classParent;
        var clContainer = defaults.classContainer;
        var clWidget = defaults.classWidget;

        megaSetup();

        function megaOver(){
            var subNav = $('.sub',this);
            $(this).addClass('mega-hover');
            if(defaults.effect == 'fade'){
                $(subNav).fadeIn(defaults.speed);
            }
            if(defaults.effect == 'slide'){
                $(subNav).show(defaults.speed);
            }
            // beforeOpen callback;
            defaults.beforeOpen.call(this);
        }
        function megaAction(obj){
            var subNav = $('.sub',obj);
            $(obj).addClass('mega-hover');
            if(defaults.effect == 'fade'){
                $(subNav).fadeIn(defaults.speed);
            }
            if(defaults.effect == 'slide'){
                $(subNav).show(defaults.speed);
            }
            // beforeOpen callback;
            defaults.beforeOpen.call(this);
        }
        function megaOut(){
            var subNav = $('.sub',this);
            $(this).removeClass('mega-hover');
            $(subNav).hide();
            // beforeClose callback;
            defaults.beforeClose.call(this);
        }
        function megaActionClose(obj){
            var subNav = $('.sub',obj);
            $(obj).removeClass('mega-hover');
            $(subNav).hide();
            // beforeClose callback;
            defaults.beforeClose.call(this);
        }
        function megaReset(){
            $('li',$dcMegaMenuObj).removeClass('mega-hover');
            $('.sub',$dcMegaMenuObj).hide();
        }

        function megaSetup(){
            $arrow = '<span class="dc-mega-icon"></span>';
            var clParentLi = clParent+'-li';
            var menuWidth = $dcMegaMenuObj.outerWidth();
            $('> li',$dcMegaMenuObj).each(function(){
                //Set Width of sub
                var $mainSub = $('> ul',this);
                var $primaryLink = $('> a',this);
                if($mainSub.length){
                    $primaryLink.addClass(clParent).append($arrow);
                    $mainSub.addClass('sub').wrap('<div class="'+clContainer+'" />');

                    var pos = $(this).position();
                    pl = pos.left;

                    if($('ul',$mainSub).length){
                        $(this).addClass(clParentLi);
                        $('.'+clContainer,this).addClass('mega');
                        $('> li',$mainSub).each(function(){
                            if(!$(this).hasClass(clWidget)){
                                $(this).addClass('mega-unit');
                                if($('> ul',this).length){
                                    $(this).addClass(clSubParent);
                                    $('> a',this).addClass(clSubParent+'-a');
                                } else {
                                    $(this).addClass(clSubLink);
                                    $('> a',this).addClass(clSubLink+'-a');
                                }
                            }
                        });

                        // Create Rows
                        var hdrs = $('.mega-unit',this);
                        rowSize = parseInt(defaults.rowItems);
                        for(var i = 0; i < hdrs.length; i+=rowSize){
                            hdrs.slice(i, i+rowSize).wrapAll('<div class="row" />');
                        }

                        // Get Sub Dimensions & Set Row Height
                        $mainSub.show();

                        // Get Position of Parent Item
                        var pw = $(this).width();
                        var pr = pl + pw;

                        // Check available right margin
                        var mr = menuWidth - pr;

                        // // Calc Width of Sub Menu
                        var subw = $mainSub.outerWidth();
                        var totw = $mainSub.parent('.'+clContainer).outerWidth();
                        var cpad = totw - subw;

                        if(defaults.fullWidth == true){
                            var fw = menuWidth - cpad;
                            $mainSub.parent('.'+clContainer).css({width: fw+'px'});
                            $dcMegaMenuObj.addClass('full-width');
                        }
                        var iw = $('.mega-unit',$mainSub).outerWidth(true);
                        var rowItems = $('.row:eq(0) .mega-unit',$mainSub).length;
                        var inneriw = iw * rowItems;
                        var totiw = inneriw + cpad;

                        // Set mega header height
                        $('.row',this).each(function(){
                            $('.mega-unit:last',this).addClass('last');
                            var maxValue = undefined;
                            $('.mega-unit > a',this).each(function(){
                                var val = parseInt($(this).height());
                                if (maxValue === undefined || maxValue < val){
                                    maxValue = val;
                                }
                            });
                            $('.mega-unit > a',this).css('height',maxValue+'px');
                            $(this).css('width',inneriw+'px');
                        });

                        // Calc Required Left Margin incl additional required for right align

                        if(defaults.fullWidth == true){
                            params = {left: 0};
                        } else {

                            var ml = mr < ml ? ml + ml - mr : (totiw - pw)/2;
                            var subLeft = pl - ml;

                            // If Left Position Is Negative Set To Left Margin
                            var params = {left: pl+'px', marginLeft: -ml+'px'};

                            if(subLeft < 0){
                                params = {left: 0};
                            }else if(mr < ml){
                                params = {right: 0};
                            }
                        }
                        $('.'+clContainer,this).css(params);

                        // Calculate Row Height
                        $('.row',$mainSub).each(function(){
                            var rh = $(this).height();
                            $('.mega-unit',this).css({height: rh+'px'});
                            $(this).parent('.row').css({height: rh+'px'});
                        });
                        $mainSub.hide();

                    } else {
                        $('.'+clContainer,this).addClass('non-mega').css('left',pl+'px');
                    }
                }
            });
            // Set position of mega dropdown to bottom of main menu
            var menuHeight = $('> li > a',$dcMegaMenuObj).outerHeight(true);
            $('.'+clContainer,$dcMegaMenuObj).css({top: menuHeight+'px'}).css('z-index','1000');

            if(defaults.event == 'hover'){
                // HoverIntent Configuration
                var config = {
                    sensitivity: 2,
                    interval: 100,
                    over: megaOver,
                    timeout: 0,
                    out: megaOut
                };
                $('li',$dcMegaMenuObj).hoverIntent(config);
            }

            if(defaults.event == 'click'){

                $('body').mouseup(function(e){
                    if(!$(e.target).parents('.mega-hover').length){
                        megaReset();
                    }
                });

                $('> li > a.'+clParent,$dcMegaMenuObj).click(function(e){
                    var $parentLi = $(this).parent();
                    if($parentLi.hasClass('mega-hover')){
                        megaActionClose($parentLi);
                    } else {
                        megaAction($parentLi);
                    }
                    e.preventDefault();
                });
            }

            // onLoad callback;
            defaults.onLoad.call(this);
        }
    });
};
 })(jQuery);