wechat-pilelog/vant/checkbox-group/index.js

import { useChildren } from '../common/relation';
import { VantComponent } from '../common/component';
VantComponent({
    field: true,
    relation: useChildren('checkbox', function (target) {
        this.updateChild(target);
    }),
    props: {
        max: Number,
        value: {
            type: Array,
            observer: 'updateChildren',
        },
        disabled: {
            type: Boolean,
            observer: 'updateChildren',
        },
        direction: {
            type: String,
            value: 'vertical',
        },
    },
    methods: {
        updateChildren() {
            this.children.forEach((child) => this.updateChild(child));
        },
        updateChild(child) {
            const { value, disabled, direction } = this.data;
            child.setData({
                value: value.indexOf(child.data.name) !== -1,
                parentDisabled: disabled,
                direction,
            });
        },
    },
});