vant-weapp/dist/tab/index.js

import { VantComponent } from '../common/component';
VantComponent({
    relation: {
        name: 'tabs',
        type: 'ancestor',
        current: 'tab',
    },
    props: {
        dot: {
            type: Boolean,
            observer: 'update'
        },
        info: {
            type: null,
            observer: 'update'
        },
        title: {
            type: String,
            observer: 'update'
        },
        disabled: {
            type: Boolean,
            observer: 'update'
        },
        titleStyle: {
            type: String,
            observer: 'update'
        },
        name: {
            type: [Number, String],
            value: '',
        }
    },
    data: {
        active: false
    },
    methods: {
        getComputedName() {
            if (this.data.name !== '') {
                return this.data.name;
            }
            return this.index;
        },
        updateRender(active, parent) {
            const { data: parentData } = parent;
            this.inited = this.inited || active;
            this.setData({
                active,
                shouldRender: this.inited || !parentData.lazyRender,
                shouldShow: active || parentData.animated
            });
        },
        update() {
            if (this.parent) {
                this.parent.updateTabs();
            }
        }
    }
});