1、小程序底部导航栏就是这个底部的东西

2、这个需要在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",