微信小程序tabbar

微信小程序的tabbar是小程序底部的选项卡栏，用于快速切换小程序的不同页面。可以通过在app.json文件中配置tabBar字段来定义tabbar，如下所示：

"tabBar": {
  "color": "#666666",
  "selectedColor": "#3cc51f",
  "backgroundColor": "#ffffff",
  "list": [
    {
      "pagePath": "pages/index/index",
      "text": "首页",
      "iconPath": "images/tabbar/home.png",
      "selectedIconPath": "images/tabbar/home_active.png"
    },
    {
      "pagePath": "pages/cart/cart",
      "text": "购物车",
      "iconPath": "images/tabbar/cart.png",
      "selectedIconPath": "images/tabbar/cart_active.png"
    },
    {
      "pagePath": "pages/my/my",
      "text": "我的",
      "iconPath": "images/tabbar/my.png",
      "selectedIconPath": "images/tabbar/my_active.png"
    }
  ]
}

其中，color和selectedColor分别是tabbar未选中和选中时的文字颜色，backgroundColor是tabbar的背景色，list数组中定义了每个选项卡的页面路径、文字、未选中和选中时的图标路径等信息。