The implementation code of the function bar at the bottom of the WeChat applet

in app.json

"tabBar": {
     "color":"black",
      "list":[{
        "pagePath": "pages/index/index",
        "text":"答疑",
        "iconPath":"image/usbox.png",
        "selectedIconPath": "image/usbox-actived.png"},
        {
        "pagePath": "pages/search/search",
        "text": "Find an expert",
        "iconPath":"image/search.png",
        "selectedIconPath": "image/search-actived.png"
        },
         {
        "pagePath": "pages/home/home",
        "text": "我的",
        "iconPath":"image/profile.png",
        "selectedIconPath": "image/profile-actived.png"
        }]
    }