litemall/litemall-wx/lib/vant-weapp/index-anchor/index.js

import { VantComponent } from '../common/component';
VantComponent({
    relation: {
        name: 'index-bar',
        type: 'ancestor',
        linked(target) {
            this.parent = target;
        },
        unlinked() {
            this.parent = null;
        }
    },
    props: {
        useSlot: Boolean,
        index: null
    },
    data: {
        active: false,
        wrapperStyle: '',
        anchorStyle: ''
    }
});