shenweishi/wxcomponents/vant/tabbar-item/index.js

import { VantComponent } from '../common/component';
VantComponent({
    props: {
        info: null,
        icon: String,
        dot: Boolean,
        name: {
            type: [String, Number]
        }
    },
    relation: {
        name: 'tabbar',
        type: 'ancestor'
    },
    data: {
        active: false
    },
    methods: {
        onClick() {
            if (this.parent) {
                this.parent.onChange(this);
            }
            this.$emit('click');
        },
        updateFromParent() {
            const { parent } = this;
            if (!parent) {
                return;
            }
            const index = parent.children.indexOf(this);
            const parentData = parent.data;
            const { data } = this;
            const active = (data.name || index) === parentData.active;
            const patch = {};
            if (active !== data.active) {
                patch.active = active;
            }
            if (parentData.activeColor !== data.activeColor) {
                patch.activeColor = parentData.activeColor;
            }
            if (parentData.inactiveColor !== data.inactiveColor) {
                patch.inactiveColor = parentData.inactiveColor;
            }
            return Object.keys(patch).length > 0
                ? this.set(patch)
                : Promise.resolve();
        }
    }
});