微信小程序开发之选项卡(窗口底部TabBar)页面切换

//app.json {  "pages":[   "pages/index/index",   "pages/logs/logs"  ],  "window":{   "backgroundTextStyle":"light",   "navigationBarBackgroundColor": "#999999",   "navigationBarTitleText": "tab",   "navigationBarTextStyle":"white"  },   "tabBar": {   "color": "#ccc",   "selectedColor": "#35495e",   "borderStyle": "white",   "backgroundColor": "#f9f9f9",   "list": [    {     "text": "首页",     "pagePath": "pages/index/index",     "iconPath": "images/home.png",     "selectedIconPath": "images/home-actived.png"    },    {     "text": "目录",     "pagePath": "pages/catalogue/catalogue",     "iconPath": "images/note.png",     "selectedIconPath": "images/note-actived.png"    },    {     "text": "我的",     "pagePath": "pages/mine/mine",     "iconPath": "images/profile.png",     "selectedIconPath": "images/profile-actived.png"    }   ]  } }