vant-weapp/packages/tabbar-item/index.ts

import { VantComponent } from '../common/component';

VantComponent({
  props: {
    info: null,
    icon: String,
    dot: Boolean
  },

  relation: {
    name: 'tabbar',
    type: 'ancestor'
  },

  data: {
    active: false
  },

  methods: {
    onClick() {
      const parent = this.getRelationNodes('../tabbar/index')[0];
      if (parent) {
        parent.onChange(this);
      }
      this.$emit('click');
    },

    setActive(active) {
      if (this.data.active !== active) {
        this.setData({ active });
      }
    }
  }
});