微信小程序实现topBar底部选择栏效果

{
 "pages": [//有几个页面，pages里面就要绑定几个
  "pages/dujia/dujia",
  "pages/index/index",
  "pages/info/info"
 ],
 "window": {
  "backgroundTextStyle": "dark",
  "navigationBarBackgroundColor": "#DF3031",
  "navigationBarTitleText": "Bar练习",
  "navigationBarTextStyle": "white"
 },
 "tabBar": {
  "color": "#000000",
  "selectedColor": "#DF3031",
  "list": [
   {
    "pagePath": "pages/index/index",
    "text": "第一页",
    "iconPath": "images/1.png",
    "selectedIconPath": "images/1.png"
   },
   {
    "pagePath": "pages/dujia/dujia",
    "text": "第二页",
    "iconPath": "images/2.png",
    "selectedIconPath": "images/2.png"
   },
   {
    "pagePath": "pages/info/info",
    "text": "第三页",
    "iconPath": "images/3.jpg",
    "selectedIconPath": "images/3.jpg"
   }
  ]
 }
}

<view>
 第一页
</view>