关于自定义tabBar

老师，我的代码没有生效，

{
  "pages":[
    "pages/index/index",
    "pages/logs/logs"
  ],
  "window":{
    "backgroundTextStyle":"light",
    "navigationBarBackgroundColor": "#ffff",
    "navigationBarTitleText": "Diro",
    "navigationBarTextStyle":"black",
    "enablePullDownRefresh": true
  },
  "tabBar": {
    "custom": true,
    "color": "#000000",
    "selectedColor": "#000000",
    "backgroundColor": "#000000",
    "list": [{
      "pagePath": "pages/index/index",
      "text": "组件"
    }, {
      "pagePath": "pages/logs/index",
      "text": "接口"
    }]
  },
  "style": "v2",
  "sitemapLocation": "sitemap.json"
}

没理解第二步的意思