我在对应的tabbar页面都加入了这个

下面是tabbar对应的js文件

Component({
  data: {
    selected: 0,
    "color": "#868686",
    "selectedColor": "#2929C7",
    "list": [{
      "pagePath": "/pages/index/index",
      "iconPath": "/images/slices/组 780.png",
      "selectedIconPath": "/images/slices/组 797.png",
      "text": "监测"
    },
    {
      "pagePath": "/pages/record/record",
      "text": "记录",
      "iconPath": "/images/slices/组 806.png",
      "selectedIconPath": "/images/slices/reduce.png"
    },
    {
      "pagePath": "/pages/my/my",
      "text": "我的",
      "iconPath": "/images/slices/组件 7 – 13.png",
      "selectedIconPath": "/images/slices/组件 7 – 15.png"
    }]
  },
  attached() {
  },
  methods: {
    switchTab(e) {
      let that = this
      const data = e.currentTarget.dataset
      const url = data.path
      wx.switchTab({ url })
      that.setData({
        selected: data.index
      })
      console.log(data.index);
    }
  }
})