小程序的tabbar不显示

1. tabbar 不显示

刚开始给页面加tabbar时

{
  "pages":[
  "pages/index/index",
    "pages/all/all",
    "pages/relax/relax",
    "pages/me/me",
    "pages/wen/wen",
    "pages/logs/logs"
  ],
  "window":{
    "backgroundTextStyle":"light",
    "navigationBarBackgroundColor": "#fff",
    "navigationBarTitleText": "WeChat",
    "navigationBarTextStyle":"black"
  },
  "tabBar": {  
   "color": "#a9b7b7",  
   "selectedColor": "#11cd6e",  
   "borderStyle":"white",  
   "list": [{  
     "selectedIconPath": "images/all2.png",  
     "iconPath": "images/all1.png",  
     "pagePath": "pages/all/all",  
     "text": "all"  
   }, {  
     "selectedIconPath": "images/wen2.png",  
     "iconPath": "images/wen1.png",  
     "pagePath": "pages/wen/wen",  
     "text": "文"    
   }, {  
     "selectedIconPath": "images/relax2.png",  
     "iconPath": "images/relax1.png",  
     "pagePath": "pages/relax/relax",  
     "text": "relax"  
   }, {  
     "selectedIconPath": "images/me2.png",  
     "iconPath": "images/me1.png",  
     "pagePath": "pages/me/me",  
     "text": "我"  
   }]  
 }
}

创建完每个文件夹后发现一点没报错。可地下的tabbar就是不显示（懵逼状）；
网上查到前人经验：

"pages":[
    "pages/all/all",
    "pages/relax/relax",
    "pages/me/me",
    "pages/wen/wen",
    "pages/logs/logs",
    "pages/index/index"
  ],

底下的配置都不用改，只是将pages里面的index文件不要放在第一行，tabbar就神奇的出现了
原因是在pages配置的时候第一行写那个页面小程序进来就显示那个页面，如果第一行写index页，而底下配置（relax，me,all,wen,）都是新起的页面,如果显示index当然就看不见底下的tabbar，当然也不会报错