vant-weapp/packages/tab/index.ts

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

VantComponent({
  relation: {
    name: 'tabs',
    type: 'ancestor',
    linked(target) {
      this.parent = target;
    },
    unlinked() {
      this.parent = null;
    }
  },

  props: {
    dot: Boolean,
    info: null,
    title: String,
    disabled: Boolean,
    titleStyle: String,
    name: {
      type: [Number, String],
      value: '',
    }
  },

  data: {
    width: null,
    inited: false,
    active: false,
    animated: false
  },

  watch: {
    title: 'update',
    disabled: 'update',
    dot: 'update',
    info: 'update',
    titleStyle: 'update'
  },

  methods: {
    setComputedName() {
      this.computedName = this.data.name || this.index;
    },

    getComputedName() {
      if (this.data.name !== '') {
        return this.data.name;
      }
      return this.index;
    },

    update() {
      if (this.parent) {
        this.parent.updateTabs();
      }
    }
  }
});