Taro开发微信小测试,配置tabBar 无效?

用Taro开发微信小程序,想配置底部tabBar,我的配置如下,但是不生效

app.config.js 配置,

export default defineAppConfig({
  pages: [
    "pages/bar/bar1",
    "pages/bar/bar2",
  ],
  window: {
    backgroundTextStyle: "light",
    navigationBarBackgroundColor: "#fff",
    navigationBarTitleText: "WeChat",
    navigationBarTextStyle: "black",
  },
  tabBar: {
    custom: true,
    color: '#000000',
    selectedColor: '#000000',
    backgroundColor: '#000000',
    list: [
      {
        pagePath: "pages/bar/bar1",
        text: "测试bar-one",
      },
      {
        pagePath: "pages/bar/bar2",
        text: "测试bar-two",
      },
    ],
  },
  "usingComponents": {}
});