求大神帮我看下jq的代码，高分悬赏啊

[翻白眼的小妹子]

遇到的问题是：
我想通过点击一级分类，筛选当前分类的文章内容和子菜单（已经实现）；
当出现子菜单的时候，无法点击子菜单进行筛选，不知道怎么写了。。


这是模板里面的代码：

<div class="screen2 in" style=" top: 2rem; position: absolute;">
 	<div class="cate" data-catlevel="{$catlevel}">
		<div class="item" data-level="1" style="overflow:hidden">
		   {loop $allcategory['parent'] $c}
		   <nav data-id="{$c['id']}" style="float:left;margin:5px">{$c['name']}</nav>
		   {/loop}
    	 </div>
		{if $catlevel>=2}
		<div class="item2 item" data-level="2" style="overflow:hidden;"></div>
		{/if}
  	</div>
   </div>

浏览器解析后

  <div class="screen2 in" style=" top: 2rem; position: absolute;">
 	<div class="cate" data-catlevel="2">
		<div class="item" data-level="1" style="overflow:hidden">
		   		   <nav data-id="22" style="float:left;margin:5px">栏目分类</nav>
		   		   <nav data-id="23" style="float:left;margin:5px">栏目分类</nav>
		   		   <nav data-id="26" style="float:left;margin:5px">栏目分类</nav>
		   		   <nav data-id="27" style="float:left;margin:5px">栏目分类</nav>
		   		   <nav data-id="24" style="float:left;margin:5px">栏目分类</nav>
		   		   <nav data-id="28" style="float:left;margin:5px">栏目分类</nav>
 		       	 </div>
				<div class="item2 item" data-level="2" style="overflow:hidden;"></div>
		  	</div>
   </div>

jq代码:

define(['core', 'tpl', 'biz/goods/picker', 'biz/goods/wholesalePicker'], function(core, tpl, picker, wholesalePicker) {
	var defaults = {
		keywords: '',
		isrecommand: '',
		ishot: '',
		isnew: '',
		isdiscount: '',
		issendfree: '',
		istime: '',
		cate: '',
		order: '',
		by: 'desc',
		merchid: 0
	};
	var modal = {
		page: 1,
		params: {},
		lastcate: false
	};
	modal.init = function(params) {
		modal.params = $.extend(defaults, params || {});
		var leng = $.trim($('.container').html());
		if (leng == '') {
			modal.page = 1;
			modal.getList()
		}
		$('form').submit(function() {
			$('.container').empty();
			modal.params = defaults;
			modal.page = 1;
			modal.params.keywords = $('#search').val();
			modal.getList();
			return false
		});
		$('#search').bind('input propertychange', function() {
			if ($.trim($(this).val()) == '') {
				$('.container').empty();
				$('.sort .item-price').removeClass('desc').removeClass('asc');
				modal.params = defaults;
				modal.page = 1;
				modal.params.keywords = '';
				modal.getList()
			}
		});
		modal.bindCategoryEvents();
		$('#listblock').click(function() {
			if ($(this).hasClass('icon-app')) {
				$(this).removeClass('icon-app').addClass('icon-sort')
			} else {
				$(this).removeClass('icon-sort').addClass('icon-app')
			}
			$('.container').toggleClass('block')
		});
		$('.fui-content').infinite({
			onLoading: function() {
				modal.getList()
			}
		});
		modal.bindEvents()
	};
	
//这里是重点：：：：就是这个地方
modal.bindCategoryEvents = function() {
		$('.screen2 .cate .item nav').unbind('click').click(function() {
			var catlevel = $(this).closest('.cate').data('catlevel');
 			var item = $(this).parent();
			item.find('nav.on').removeClass('on');
			$(this).addClass('on');
			var level = item.data('level');
  			modal.lastcateid = $(this).data('id');
  			if (level >= catlevel) {
				return
			}
 			if (modal.lastcateid) {
				modal.params.cate = modal.lastcateid
			}
  			var items = $(".subcategory  .item[data-level='" + level + "'] ~ .item");
  			items.html('');
			var next = $(this).closest('.item').next('.item');
			var children = window.category['children'][modal.lastcateid];
			var HTML = "";
			$.each(children, function() {
				HTML += "<nav class='nav' data-id='" + this.id + "'>" + this.name + "</nav> ";
 			});
  			$('.container').html(''), $('.infinite-loading').show(), $(".content-empty").hide();
			modal.page = 1, modal.getList();
 			next.html(HTML);
			modal.bindCategoryEvents()
		});
	};
	modal.showFilter = function() {
		$('.fui-mask-m').show().addClass('visible');
		$('.screen2').addClass('in');
		$('.screen2 .btn').unbind('click').click(function() {
			var type = $(this).data('type');
			if ($(this).hasClass('btn-danger-o')) {
				$(this).removeClass('btn-danger-o').addClass('btn-default-o');
				$(this).find('.icon').hide()
			} else {
				$(this).removeClass('btn-default-o').addClass('btn-danger-o');
				$(this).find('.icon').show()
			}
		});
		$('.screen2 .cancel').unbind('click').click(function() {
			modal.cancelFilter()
		});
		$('.screen2 .confirm').unbind('click').click(function() {
			$('.screen2 .btn').each(function() {
				var type = $(this).data('type');
				if ($(this).hasClass('btn-danger-o')) {
					modal.params[type] = "1"
				} else {
					modal.params[type] = ""
				}
			});
			if (modal.lastcateid) {
				modal.params.cate = modal.lastcateid
			}
			modal.closeFilter();
			$('.container').html(''), $('.infinite-loading').show(), $(".content-empty").hide();
			modal.page = 1, modal.getList()
		});
		modal.bindCategoryEvents();
		$('.fui-mask-m').unbind('click').click(function() {
			modal.closeFilter()
		})
	};
	modal.cancelFilter = function() {
  		$('.screen2 .cate .item nav').removeClass('on');
		$('.screen2 .cate .item:first-child ~ .item').html('');
		defaults.cate = '';
		modal.params = defaults, modal.getList()
	};
 	modal.bindEvents = function() {
		$('.buy').unbind('click').click(function() {
			var goodsid = $(this).closest('.fui-goods-item').data('goodsid');
			var type = $(this).closest('.fui-goods-item').data('type');
			if (type == 20) {
				location.href = core.getUrl('goods/detail', {
					id: goodsid
				})
			} else {
				if ($(this).data('type') == 4) {
					wholesalePicker.open({
						goodsid: goodsid
					})
				} else {
					picker.open({
						goodsid: goodsid,
						total: 1,
						optionid: 0
					})
				}
			}
		})
	};
	modal.getList = function() {
		modal.params.page = modal.page;
		core.json('goods/get_list', modal.params, function(ret) {
			$('.infinite-loading').hide();
			var result = ret.result;
			if (result.total <= 0) {
				$('.content-empty').show();
				$('.fui-content').infinite('stop')
			} else {
				$('.content-empty').hide();
				$('.fui-content').infinite('init');
				if (result.list.length <= 0 || result.list.length < result.pagesize) {
					modal.stopLoading = true;
					$('.fui-content').infinite('stop')
				}
			}
			modal.page++;
			core.tpl('.container', 'tpl_goods_list', result, modal.page > 1);
			modal.bindEvents()
		})
	};
	return modal
});