微信小程序底部导航栏（tabbar）

在app.json处设置“tabBar”，例子如下：

{
  "pages": [
    "pages/index/index",
    "pages/pages1/pages1",
    "pages/pages2/pages2"
  ],
  "window": {
    "backgroundTextStyle": "light",
    "navigationBarBackgroundColor": "#ffffff",
    "navigationBarTitleText": "小程序名称",
    "navigationBarTextStyle": "black",
    "backgroundColor": "#EA0000"
  },
  "sitemapLocation": "sitemap.json",
  "tabBar": {
    "color": "#666666",
    "selectedColor": "#f10b2e",
    "list": [
      {
        "pagePath": "pages/pages1/pages1",
        "text": "页面1",
        "iconPath": "*****",//未选中时的图标
        "selectedIconPath": "*****"//选中后的图标
      },
      {
        "pagePath": "pages/pages2/pages2",
        "text": "页面2",
        "iconPath": "*****",//未选中时的图标
        "selectedIconPath": "*****"//选中后的图标
      }
    ]
  }
}需要注意的是：其他页面要跳转到tabBar页面，需要使用wx.switchTab，例子如下：

wx.switchTab({
        url: '../pages1/pages1'
      })

来源：https://www.cnblogs.com/pp8080/p/11939220.html