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" 
   } 
  ] 
 } 
}