小程序tabBar选中后有蓝色背景？

小程序原生tabBar在选中后，出现蓝色背景图色，

机型：iPhone 6sPlus，

版本：iOS10.3.3，

代码：

"tabBar": {

    "color": "#666666",

    "selectedColor": "#2F82FA",

    "backgroundColor": "#FFFFFF",

    "list": [{

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

      "iconPath": "assets/images/tabBar1.png",

      "selectedIconPath": "assets/images/tabBar1-select.png",

      "text": "首页"

    }, {

      "pagePath": "pages/website/website",

      "iconPath": "assets/images/tabBar2.png",

      "selectedIconPath": "assets/images/tabBar2-select.png",

      "text": "官网"

    }]

  },