vant/packages/mixins/find-parent.js

/**
 * find parent component by name
 */

export default {
  methods: {
    findParentByName(name) {
      if (!this.parentGroup) {
        let parent = this.$parent;
        while (parent) {
          if (parent.$options.name === name) {
            this.parentGroup = parent;
            break;
          }
          parent = parent.$parent;
        }
      }

      return this.parentGroup;
    }
  }
};