tabBar未选中状态不显示图标，选中状态显示图标。

"pages": [

    "pages/index/index",

    "pages/index2/index",

    "pages/logs/logs"

  ],

"tabBar": {

    "color": "#00000f",

    "selectedColor": "#ff0000",

    "list": [

    {

      "pagePath": "pages/index/index",

      "text": "首页",

      "iconsPath":"icons/home.png",

      "selectedIconPath": "icons/home_active.png"

    },

    {

      "pagePath": "pages/index2/index",

      "text": "导航",

      "iconsPath":"icons/navigation.png",

      "selectedIconPath": "icons/navigation_active.png"

    },

    {

      "pagePath": "pages/logs/logs",

      "text": "日志",

      "iconsPath": "icons/setting.png",

      "selectedIconPath": "icons/setting_active.png"

    }]

  }