uniapp 配置tabBar后微信小程序不显示导航栏

以下是tabbar配置，页面和图片资源都存在，尝试用真机调试也不显示底部导航栏

"tabBar": {  
        "custom":false,  
        // "position":"bottom",  
        "borderStyle": "black",  
        "backgroundColor": "#ffffff",  
        "selectedColor": "#00aa00",  
        // "height": "60px",  
        "color": "#444444",  
        "list": [  
            {  
                "pagePath": "pages/pre/pre",  
                "iconPath": "static/images/pre.png",  
                "selectedIconPath": "static/images/pre_s.png",  
                "text": "预约"  
            },  
            {  
                "pagePath": "pages/user/user",  
                "iconPath": "static/images/me.png",  
                "selectedIconPath": "static/images/me_s.png",  
                "text": "我的"  
            }  
        ],  
    },