单独三级导航
    
    	数据源:name='three_nav'
    	菜单结构
        [id] => 菜单ID
        [title] => 菜单名称
        [url] => 菜单链接
        [target] => 菜单何处打开链接文档
        [icon] => 菜单图标
        [current] => 菜单是否当前焦点【样式名】
        [childs] => 子菜单
    
    	HTML标签样例:
    	<div class="clumb-box swiper-wrapper">
    	{notempty name="three_nav"}
		{volist name='three_nav' id='item_three'}
		<a href="{$item_three.url}" class="swiper-slide {$item_three.current}">{$item_three.title}</a>
		{/volist}      
    	{/notempty}            
    	</div>   
    
Array ( [43] => Array ( [id] => 43 [title] => 网站首页 [url] => /index.html [target] => _self [icon] => [current] => current ) [44] => Array ( [id] => 44 [title] => 关于三思 [url] => /about.html [target] => _self [icon] => [childs] => Array ( [52] => Array ( [id] => 52 [title] => 公司介绍 [url] => /about.html [target] => _self [icon] => /uploads/website/image/20210108/5131dee41d95196042573397787b922d.jpg ) [53] => Array ( [id] => 53 [title] => 企业文化 [url] => /about/53.html [target] => _self [icon] => ) [54] => Array ( [id] => 54 [title] => 资质荣誉 [url] => /about-album/54.html [target] => _self [icon] => ) ) [current] => ) [45] => Array ( [id] => 45 [title] => 产品中心 [url] => /product/45.html [target] => _self [icon] => [childs] => Array ( [65] => Array ( [id] => 65 [title] => 电子万能试验机 [url] => /product/65.html [target] => _self [icon] => /uploads/website/image/20210108/7b68c8f617c59f505c85d1737db4ceb5.jpg [childs] => Array ( [81] => Array ( [id] => 81 [title] => CMT5000 [url] => /product/81.html [target] => _self [icon] => /uploads/website/image/20210108/7b68c8f617c59f505c85d1737db4ceb5.jpg ) [82] => Array ( [id] => 82 [title] => CMT4000 [url] => /product/82.html [target] => _self [icon] => /uploads/website/image/20210108/7b68c8f617c59f505c85d1737db4ceb5.jpg ) [83] => Array ( [id] => 83 [title] => CMT1000 [url] => /product/83.html [target] => _self [icon] => /uploads/website/image/20210108/7b68c8f617c59f505c85d1737db4ceb5.jpg ) [84] => Array ( [id] => 84 [title] => CMT2000 [url] => /product/84.html [target] => _self [icon] => /uploads/website/image/20210108/7b68c8f617c59f505c85d1737db4ceb5.jpg ) ) ) [66] => Array ( [id] => 66 [title] => 高温持久蠕变试验机 [url] => /product/66.html [target] => _self [icon] => [childs] => Array ( [85] => Array ( [id] => 85 [title] => 电子式 [url] => /product/85.html [target] => _self [icon] => ) [86] => Array ( [id] => 86 [title] => 机械式 [url] => /product/86.html [target] => _self [icon] => ) ) ) [67] => Array ( [id] => 67 [title] => 塑料落锤冲击试验机 [url] => /product/67.html [target] => _self [icon] => ) [68] => Array ( [id] => 68 [title] => 电子扭转试验机 [url] => /product/68.html [target] => _self [icon] => ) [69] => Array ( [id] => 69 [title] => 电液伺服万能试验机 [url] => /product/69.html [target] => _self [icon] => ) [70] => Array ( [id] => 70 [title] => 电液伺服钢绞线试验机 [url] => /product/70.html [target] => _self [icon] => ) [74] => Array ( [id] => 74 [title] => 金属摆锤冲击试验机 [url] => /product/74.html [target] => _self [icon] => ) [75] => Array ( [id] => 75 [title] => 塑料摆锤冲击试验机 [url] => /product/75.html [target] => _self [icon] => ) [76] => Array ( [id] => 76 [title] => 热变形维卡软化点试验机 [url] => /product/76.html [target] => _self [icon] => ) [77] => Array ( [id] => 77 [title] => 熔体流动速率试验机 [url] => /product/77.html [target] => _self [icon] => ) [78] => Array ( [id] => 78 [title] => 冲击试验低温仪 [url] => /product/78.html [target] => _self [icon] => ) [79] => Array ( [id] => 79 [title] => 冲击试样缺口拉床 [url] => /product/79.html [target] => _self [icon] => ) [80] => Array ( [id] => 80 [title] => 钢筯弯曲试验机 [url] => /product/80.html [target] => _self [icon] => ) ) [current] => ) [46] => Array ( [id] => 46 [title] => 附件中心 [url] => /product/46.html [target] => _self [icon] => [childs] => Array ( [71] => Array ( [id] => 71 [title] => 电子万能试验机附件 [url] => /product/71.html [target] => _self [icon] => /uploads/website/image/20210108/c893806fb09613709d3488884de74c07.jpg ) [72] => Array ( [id] => 72 [title] => 夹具 [url] => /product/72.html [target] => _self [icon] => ) [73] => Array ( [id] => 73 [title] => 附件 [url] => /product/73.html [target] => _self [icon] => ) ) [current] => ) [47] => Array ( [id] => 47 [title] => 测试方法与解决方案 [url] => /article/63.html [target] => _self [icon] => [childs] => Array ( [63] => Array ( [id] => 63 [title] => 测试方法 [url] => /article/63.html [target] => _self [icon] => /uploads/website/image/20210108/a242f48e7500e80431e2509801ee535b.jpg ) [64] => Array ( [id] => 64 [title] => 解决方案 [url] => /article/64.html [target] => _self [icon] => ) ) [current] => ) [48] => Array ( [id] => 48 [title] => 工程案例 [url] => /project.html [target] => _self [icon] => [current] => ) [49] => Array ( [id] => 49 [title] => 服务支持 [url] => /service/58.html [target] => _self [icon] => [childs] => Array ( [58] => Array ( [id] => 58 [title] => 服务承诺 [url] => /service/58.html [target] => _self [icon] => /uploads/website/image/20210108/0ff9c91d104fddfe815dfe1efa7b5298.jpg ) [59] => Array ( [id] => 59 [title] => 售前支持 [url] => /service/59.html [target] => _self [icon] => ) [60] => Array ( [id] => 60 [title] => 售后服务 [url] => /service/60.html [target] => _self [icon] => ) [61] => Array ( [id] => 61 [title] => 维保服务 [url] => /service/61.html [target] => _self [icon] => ) [62] => Array ( [id] => 62 [title] => 下载中心 [url] => /download-list/62.html [target] => _self [icon] => ) ) [current] => ) [50] => Array ( [id] => 50 [title] => 新闻中心 [url] => /news.html [target] => _self [icon] => [childs] => Array ( [55] => Array ( [id] => 55 [title] => 最新活动 [url] => /news/55.html [target] => _self [icon] => /uploads/website/image/20210108/53b20618de870f9d6d1d53ea32618151.jpg ) [56] => Array ( [id] => 56 [title] => 公司新闻 [url] => /news/56.html [target] => _self [icon] => ) [57] => Array ( [id] => 57 [title] => 行业新闻 [url] => /news/57.html [target] => _self [icon] => ) ) [current] => ) [51] => Array ( [id] => 51 [title] => 联系我们 [url] => /contact.html [target] => _self [icon] => [current] => ) )