jQuery插件实现控制网页元素动态居中显示

(function($) { $.fn._center = function(self, parent, dimension) { if(!dimension.vertical && !dimension.horizontal) return; //won't do anything anyway if(parent) parent = self.parent(); else parent = window self.css("position", "absolute"); if(dimension.vertical) { self.css("top", Math.max(0, (($(parent).height() - $(self).outerHeight()) / 2) + $(parent).scrollTop()) + "px"); } if(dimension.horizontal) { self.css("left", Math.max(0, (($(parent).width() - $(self).outerWidth()) / 2) + $(parent).scrollLeft()) + "px"); } return self; }; $.fn.center = function(parent, args) { if(!args) { args = {horizontal: true, vertical: true}; } return this.each(function() { var obj = $(this); obj._center(obj, parent, args); function callback() { obj._center(obj, parent, args); } callback(); $(window).resize(callback); }); }; })(jQuery);